Exposing the battery to high temperature and dwelling in a full state-of-charge for an extended time can be more stressful than cycling. But it was a 2-1 defeat nonetheless. Usually after the lottery of a penalty shoot-out the winning team tries to show some sympathy for the losers, understanding all too well what it feels like to be in their skin. Working in the winter in Iowa, freezing temperatures are common at worksites. It makes no sense to spend maintenance resources to service or replace an item whose reliability has not degraded. Should I put the battery back in and then use the laptop off the mains? The key witness lived in the first-floor apartment in the tiny Donegal village where an explosion killed ten people and injured scores of others. Everything degrades with time, thats life. If you have a 100% DoD youve now gotten 10 units of use per recharge. i agree! I have a question - I see lot of experts here, I would be thankfull if someone can answer this question. Thanks! you go and test to see if Pump B will start. With one caveat though - you shouldn't leave the device on charge all the time; normal use for a portable device is to disconnect it for at least a few hours a day when you move it around, so I generally stick to that. The experts will tell you that there is no "conditioning" needed with Li-Ion, however I have seen first hand experience which begs to differ. When running it on the mains do I take the battery out? Pharmacies say they are losing thousands of pounds a week on the cost of the drugs as they can only recoup a fraction from the NHS. However I do move it between my office and my deck and don't want the hassle of shutting down between those moves so my battery remains in my laptop at all times. Am I on the right track or deluded? Lt(New ) if C>300 charge cycle I want this kind of relation for Li ion Battery. Im sure there are other answers, but I do feel lonely offering something different. Besides selecting the best-suited voltage thresholds for a given application, a regular Li-ion should not remain at the high-voltage ceiling of 4.20V/cell for an extended time. thanks wezz. And the US Department of Defense (DoD) thought so too. I have used a lower powered charger on my mobile phone and it does seem to help re temp. https://www.researchgate.net/publication/303890624_Modeling_of_Lithium-Ion_Battery_Degradation_for_Cell_Life_Assessment. Note that laptop batteries are not that cheap you should expect to pay at least $50. 3. Do you believe this to be a coincidence or quality factor. But does 50% DoD mean cycling the charge between 50% charge and 100% ? I'm also guessing that the T1114 charge controller is not a well fleshed out design, being incapable of recovering this cell from this state of discharge. I would greatly appreciate any and all input regarding this questions, smartwatch batteries in general and those for the S2 Classic and S3 Classic in particular. If the charger says 1.0A, that is the maximum current it is designed to deliver, but that doesn't mean the smartphone will send that much to the battery. Ultimately it's up to you, if you want to maximize longevity and/or you keep for phone for 3+years you can just turn quick charge off, and charge with the mains adapter. I believe the batteries discharged to 2.6% of their recommended full charge, sleep mode kicking in at about 5-6% of full charge. . My question is. However quick charge ONLY activates from 0%-50 or 60%, after which it will switch back to standard charging. Thanks John H. I was just hoping that there was a trick to actually getting the performance from the batteries that was promised in the sales pitch for the product. My reasoning is that I want to keep the voltage per cell low by not charging it too high, and I want to make the depth of discharge as low as possible since i will be using it at home and will always have a charger available. Racing around having a festive time takes its toll on the eyes. (4) Never worry about it. Charge to 4.20 volts with high current (1-2 amps) en then stop when voltage is dropping. You're absolutely correct, most people will not keep their devices or phones long enough. The reason I ask is because there is a device called a Nintendo Switch, which is a video game console that can be plugged to a TV via a dock or taken on the go. I just purchased a cell phone and was wondering if I purchased a replacement battery but never charged it keeping as a spare would this be possible or do Lithium Ion batteries degrade with non use. My another question is, which is worse, 0% to 50% every day or 50% to 100% every day? Tensions within the SNP over its leadership and approach to independence are continuing to build after weeks of infighting, with a source close to Nicola Sturgeon accusing rebel MPs of outrageous egos and naivety. Thank you very much for your collaboration. Very interresting article. Most industrial plants will keep running longer than we think. When the voltage drops to say 14% a pop up tells you to plug in before your Laptop hibernate. There is no memory and the battery does not need periodic full discharge cycles to prolong life. Plus, Jones himself on why he drafted him in as one of his assistant coaches. The maintenance schedule for the 747-100 was the first to apply Reliability Centered Maintenance concepts using MSG-1. 1) Using a charge controller and a 5V solar panel - thus fully charging the batteries each sunny day 2) Using no charge controller and a 4V solar panel - thus never fully charging the batteries and having my voltage float up and down each day (never a complete cycle) Naturally both would need over discharge protection. Allh is simply the Arabic word for "The God." Very tough technology and very long cycle life. Ideally, a battery management program would allow several charging targets: - MAX portable runtime (ie, 100%) - UPS use (eg, as desktop computer or low-usage phone days) (3.92v or 50%) - several steps in between MAX and UPS for flexibility. Thanks Hesam. Thank you for this wonderful article and do convey my best wishes to derp ( honestly he is a good soul ). I also never claimed that discharging the battery by 100% would not limit its recharge cycles. He has shielded his acquisitions, which began in summer 2021 with the purchase of Firefly, through a series of limited liability corporations registered with the state. The tool has a year warranty. Many Li-ion batteries will hold charge and maintain their performance for a decade or more. A lot of maintenance is done with the equipment off-line. Under the collective branding Lenox Eats, Salame owns: Firefly Gastropub & Catering Co., the locally popular restaurant and live entertainment spot on Church Street. Also, if the charger effectively disconnects the battery at 100% and the laptop runs direct from the charger, surely when leaving the charger connected all the time will not affect the battery, which will stay cool, though at 100%. So what are you saying Pavlo? Your battery is happy at the same temperature you are comfortable. I appreciated it that this bulletin gave me the best answer. My five-year-olds behaviour in class is getting worse he just refuses to follow instructions, one worried motherMy five-year-olds behaviour in class is getting worse he just refuses to followMy five-year-olds behaviour in class is getting worse he just refuses to follow Finding the right school for your child is daunting. The charger is putting out 5v. However, the OS illustrates a lightning bolt over the battery icon at the top of the screen which suggests the battery is charging when in fact it isn't. You can recharge it 500 times youve now gotten 5000 units of use from the battery. You should prime the battery the first few days though by draining it completely and charging completely. Adrian, Table 3 and Figure 6 allow you to make a rough calculation and I would say that cycling between 75-45% (approx. So, in the last graph, you should be reading off the number of cycles on the y-axis, against each charge/discharge rate on the x-axis. So it can take 500 cycles of total discharge (100% discharged to 0%) or 4700 cycles of 10% discharge (100% charged dischragd to 90%). I studied a bit deeper hoping that common Mac hardware has general purpose access to that line such that software could control or influence it, thus allowing a utility to control state of charge of the battery like the Sony Vaio and Lenovo ThinkPad, but evidently it doesn't. For example in a complex petrochemical plant, you could end up doing major overhauls or inspections (during a shutdown) based on condition assessments which determine the final scope of work. These are points I would have appreciated knowing about at the beginning of the article rather than slogging through rheams of data (which I appreciate) but honestly do not have time to read through :). I must say it was informative and concise article on this very demanding subject. You bought this item to use, so use it. Lithium-ion, like lead-acid, does not benefit from deep discharge - you will get longer life from lithium-ion chemistry by only discharging to 25-30% and re-charging to 80-90% - storing it at full charge (100%) for a long time is also not good - which is the topic of this forum, actually. Upgrade your spare room and make your guests feel at home, The subscription gifts that keep on giving, I raced an eagle down a French mountain. Very useful article even in my field which deals with non mechanical items and their failure. I recharge the battery (8.4v, 0.9amp Nikon charger) as soon as the camera displays a 'low battery' symbol in the viewfinder. The history of maintenance is quite interesting, funny to see how the pendulum swung too far into the preventative maintenance direction from doing no preventative maint. I gather Windows 7 has provisions to control battery charge levels but they're only effective when the system's active - in sleep or shutdown mode those provisions can't function, so the battery then charges to the level set by hardware (probably 4.2 V/cell or very close). If the equipments inherent reliability or performance is poor, doing more maintenance will not help. I am sorry about my lack of understanding but I just purchased a new battery for my laptop. Me too, even above total use (total of units of use, that is, sum of all depth of discharge times number of discharges) - I want my portable devices to remain usable in portable mode for as many years as possible. A charge cycle is a complete 100% to 0% drain (this is 1 cycle). If not, how far down, percentage wise, do I allow the battery to discharge before I allow it to recharge. Shellcheck recommendation to double-quote variable does not work when piping to cut, Understanding The Fundamental Theorem of Calculus, Part 2. Sadly, macbooks (and other laptops) run much slower on fixed power (even 4x slower), when battery is removed so battery dies very quickly. I love this site, I wish there was a more active discussion forum. Do you batterys use a BMS? So, for all of those who are in doubt: try it out yourself if you are unsure. I don't understand what $# means. By doing this, you also follow the 50%DoD in this article that appears to statistically give the most hours of use for a Lit-Ion battery. But instead of selecting As 2022 winds up, we look back on 12 tumultuous months during which the curtain fell on the Elizabethan era and war returned to Europe. You can always charge it when you wake up or at work depending on your schedule.This practice is employed on experia XE and newer smartphones too. I'm trying it now with an HP dv7 battery (OEM HP from 9/2009) I guess it can't hurt. Gather the fam! I wish I was hanging up my quill (closingI cant quite believe Im writing my final column before maternity leave. I imagine few enough so that to bring them back to 40% I should leave them plugged in 10 minutes ? But it was a 2-1 defeat nonetheless. Given that, perhaps out batteries ought be say 26v or 38v etc., and our chargers set to charge .1v lower.to give a net 24 or 36v. https://ui.adsabs.harvard.edu/abs/2002JPS111..130C/abstract Who buys a horrendously expensive notebook battery just because the battery only delivers 5 hours of work time instead of 7? As a woman approaching 70 who has battled sexual discrimination all my life, I want to thank As nervous England fans settled into their seats for the teams knockout game against Senegal last Sunday, Vodafones directors assembled in front of their computer screens. which means your computer hibernates. So, it's no surprise that they lose quite a lot of the capacity within the first year of usage. For accessible cells such as in common LED flashlights, you might have full control, or nearly so. The 13-year-olds eyes are trained on a ball he is trying to dribble around a pole and into the mini-goal before his rival. On September 15, 2015 at 11:55pm Bayu Murti wrote: Actually Im little bit confused with that DoD theory. If you play games, better to do this without battery. P.S. Having a home to call our own provides a Freud thought otherwise, but when we were children the thing I most envied about my brother was his Meccano set. I have read the whole book" Batteries in a Portable World" and I would recommend it to anyone who would like to have a better understanding of batteries and the characteristics of each chemistry. GamesRadar+ takes you closer to the games, movies and TV you love. I think you're confusing charge levels with depth-of-discharge. In June the nation partied for the Queens Platinum Jubilee then queued to say goodbye three months later. Instead, the task force found six patterns describing the relationship between age and failure. We buy car & they ask us to replace oil every XXXX kms & we do it religiously. I really appreciate your technical info on Lithium-ion batteries. This would yield that the optimal total capacity gained from the battery over its lifetime is a DOD of around 50% (Plotting the four points and combining with a smooth curve indicates that the maximum is around 60-50% DoD) [*] More precisely Sum{n=0 to N-1 of DoD*(1-30%*n/N) } =DoD*(N - 30%*Sum{n=0 to N-1 of n/N}) =DoD*(N - 30%(N-1)/2) =DoD*(N*85%-15%) ~DoD* N*85% Best Regards Eske Rahn. Again charge your battery ( with your computer off ) and use your battery as above. 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Is Li-ion the Solution for the Electric Vehicle? I just bought a Craftsman 20 v Li-Ion Professional drill (display model). its the laptop manufacturing company which tells you when to recharge..If you own an android mobile phone , you should be familiar with Lithium batteries. Is it okay to leave the laptop plugged in. Remember what the article above says about heat shortening the life of the battery: charging too fast WILL raise the temperature too high and shorten its life. I thought completely discharging a Lithium-ion battery was NOT a good idea. I received two batteries with the phone but it is still a problem. It came with 74% charge so I continued to charge it to 100%. In practice, this means that 70% 90% of equipment would benefit from some form of condition monitoring. So the batteries should only be stored in a fully charged condition and the charge should be topped up from time to time by taking the car out to charge it with the alternator to compensate for the self discharge of the cells. Hi Edward - I don't understand your response. At one time, I too, was ignorant. Once you get to know your boss, youll be able to communicate more effectively with them. Reliability basics is all about so called Enablers that build and motivate health. With my apologies ~ request you to kindly post your queries in English only, mi psp no se quiere cargar.al ir a cargarla en unos segundos se apaga dazme soluciones. This moves as many ions as possible from one electrode to the other keeping them free to move instead of "stubbornly stuck". How to smoothen the round border of a created buffer to make it look more natural? Say you have a battery with an original 1000mAh capacity. If I buy a lithium ion "new battery"(no named brand) that has a date stamped on it from 2016 should I use it in my Samsung cell phone? You wont hear them being so bold today. I used a laptop 12 cells of each 1200mAh, 3.7v to build power bank.The cells were stalked in parallel. One basic principle of maintenance is not considered here i.e. So evaluate everything before you pick a solution. This simple fix it when it breaks approach to maintenance is often referred to as First Generation Maintenance. Outcomes that eventually turned the maintenance world upside down. Or does using the battery in a cold or frozen state cause the dammage? I cant quite believe Im writing my final column before maternity leave. It goes without saying that you don't store a battery with 15% or less battery or you could risk it going into "sleep mode" or being too weak/damaged to charge. WELL DUH. The Finder's battery icon has a lot of response latency, but ultimately (after a restart for me) indicates that power is connected and that the battery is not charging. Often in the design phase of new equipment. Failure Modes and Effects Analysis or FMEA for short is widely used across many industries. When I disconnected it, the battery should have been as near to 100% charge as the T1114's internal charge circuit could have done. I wish I was hanging upI cant quite believe Im writing my final column before maternity leave. Best regards. * Similar life cycles apply for batteries with different voltage levels on full charge. And since Risk = Likelihood x Consequence we can conclude that good maintenance programs are risk-based. Kind of like the lessons of WWI on the western front: you cant fight todays war with what was successful in the past. Just go to Google search and you will see hordes of articles and blogs on Lithium batteries ~ on how to maintain them, charging etc.WHATEVER INFORMATION I AM POSTING HERE IS NOT HEARSAY ~ THEY ARE BASED ON MY PERSONAL EXPERIENCE AND CONFIRMED BY H P . Walker stuck manfully to the exacting Kyle Walker won his battle against Kylian Mbapp but England lost the war. So I stuck it in the freezer for a short while and then it charged ok. As James asked above, what is the ideal partial discharge, before charging again? (Check your instruction book or if you have children, use good judgment.) Good point - read and think through the article before asking a question that was already answered. But it bottomed out at zero Friday, the financial news company reported. Many of the Filipino beer maidens, in the interest of appearing more Bavarian, sported colored contact lenses, which was a bit eerie at first, but they brought us hearty goulash, Swabian cheese noodles (aka sptzle), crispy roast pork knuckle and apple strudel, so we soon got over our initial discomfiture. I would also suggest not to drain the battery to 0%. Folks at Batteryspace.com claim much increased number of cycles (>2000) if managed conservatively. Getting another is just too expensive so how can I make it work again! These findings and experiences normally do not reach to those maintaining the equipment or managing the RCM system.. Why are we scared to say fertilitys a ticking clock? Lithium Ion technology can accept a topping charge at any time and doe not require a full charge. Thanks in advance.. And passenger safety. Their specs indicate a faster amp draw, which will result in more heat and stress on the battery as you experienced, and thus amount of cycles. At what point in the prequels is it revealed that Palpatine is Darth Sidious? i was on the go when i recieved my cell. As it was said earlier, the optimal charge level is around 50% of the battery capacity. What do you do with dead batteries? Unfortunately, neither this article nor the vendor specs tell us enough about the chargers: but overcharging is also bad for batteries, and poor chargers WILL overcharge the battery. It required just 66,000 labour hours before reaching the same 20,000 operating hours! Ria. For the first 2 years, I used to keep my laptop plugged in all the time with 100% charge state. BU-309: How does Graphite Work in Li-ion? Can a battery, namely Li-ion be charged and discharged at the same time,without a disruption in the output. The shorter the current interval, the greater the impact when extending that interval. So during the 1960s the airlines and the FAA established a joint task force to find out what was going on. In other words, what is the depth of discharge when I go from 75% charge to 25% charge? Frances goalkeeperThe last kick of the game, struck brilliantly by Marcus Rashford, whizzed inches over the bar.The last kick of the game, struck brilliantly by Marcus Rashford, whizzed inches over the bar. There, I said it. Please advise. Battery experts believe that this threshold eliminates all voltage-related stresses; going lower may not gain further benefits but induce other symptoms(See BU-808b: What causes Li-ion to die?) I don't know if they're the correct words. And what does the 3 months refer to if not the period of storage? Hello Erik I simply leave the old battery, which is below 10% capacity but still holds more than sufficient power for finishing some tasks and providing hibernation power, permanantly connected to the notebook and keep the new battery tucked away after charging it to 60%. Hey guys, just wondering in terms of preserving battery lifespan, is it better to keep a lithium-ion device at 100% (using it while plugged in) or cycling it at 50%? attendo un vostro riscontro. But when you look at the prices for original spare batteries, I guess that is why they won't do it. While club football was an itch that he had to scratch, as he put it, he clearly found it difficult to leave Northern Ireland alone at the same time, keeping in touch with senior members of the senior squad, such as Steven Davis and Jonny Evans. That means no clear wear outage. Many thanks for this information. Thanks Mike indeed Principles 6 is all about operating context. Similar provisions could also be made for consumer devices, but these are seldom offered; planned obsolescence takes care of this. The voltage for my previous phone which i need to send back at 61% battery is 3920mv so 3.92V but on this one (due to damage i suspect of being stored at 0% and sleep switch activated ) at 61% reads 3855mv (3.85V) is the difference of 70mv (0.7V) a significant difference? Another thing is to leave it in the car over night in the cold. Very much pleased with the simple and concise manner of the article. 9 Principles of a modern preventive maintenance program, #4:Parts Might Wear Out, But Your Equipment Breaks Down, Principle#7:You Cant Maintain Your Way To Reliability, https://www.amazon.com/Reliability-Centered-Maintenance-Second-John-Moubray/dp/0831131462, https://www.amazon.com/NAVSEA-Reliability-Centered-Maintenance-RCM-Handbook-ebook/dp/B00U1UJPKK, http://www.plant-maintenance.com/articles/SubmarineMaintenanceDataRCM.pdf, https://www.mainsaver.com/pdf/Reliability_Centered_Maintenance_White_Paper.pdf, https://en.wikipedia.org/wiki/Reliability-centered_maintenance, Simple guide to MTBF What it is and when to use it, Cutting maintenance: 4 steps to sustainable maintenance cost reductions. you buy a new laptop after turning on discharge to 10%, recharge fully to 100% form there on discharge to no further then 40%, recharge no further than 80% once a month discharge to 10% and then recharge to 100%. Guideline: Every 70mV drop in charge voltage lowers the usable capacity by about 10%.Note: Partial charging negates the benefit of Li-ion in terms of high specific energy. Available at: Allen, T. M. (2001) U.S. the make is ULTRA MAX, bought from AMAZON. I am also of the opinion of having a different kind of approach for the different type of failures and equipment. what should be the amount(percentage) of charging/discharging the battery to increase its life. First, from reading the comments and seeing that there is not 100% agreement on the "do's and don'ts", it would seem to me there is a missing factor, which I would respectfully suggest is manufacturing quality of the battery. I know the recommended SoC for a single 3.7 volt Li-Ion battery cell is between 3.82~3.92 volt. I looked at the source you quoted. what is certain level ? Li-ion or Lithium Ion are often used in newly produced laptop and mobile device. Such is the case with my HP DV7 laptop with it's beautiful 17.3 screen. Ideally find a charger with a selectable charging voltage, if such a product exists, and set it to 3.92 V. If not, and you have some electronics technical skill, modify the best charger you can find to reduce its charging voltage to 3.92 V. (Or construct your own - fabricate a high precision current limited regulator circuit with a very precise 3.92 V output. We have to expect and accept some failures which are out of scope best maintenance plan. Have you not worked out that your suggestion is more or less the same as buying an expensive automobile, locking it up in the garage and using buses and trains for transport instead? The bikes are stored indoors with periodic charging in winter and are recharged after each use in summer. Any thoughts? In less than 1 day, the battery had no capacity - would not hold enough charge to hold up the computer for 10 seconds. For a 3.85v battery, 4.4v is at 100%. When I got it home I tried to charge it and the charger indicated that it was defective and refused to give it a charge. But this seasonLong johns are not sexy. My Lenovo T60 from 2006 still has about 2,5 hours battery time (original battery and never changed!). (I'm extrapolating to cell phone batteries the paragraph stating that unplugging laptop batteries from AC grid is unnecessary and keeping it plugged in is safe). Dear Feanor, full charge and discharge cycles can not to 4700 cycles. so why not plugged in while in home Everyone knows that battery killers are charge and discharge plus heat :) live happy homie. Energy Cells, which most consumer products have, should be charged at 1C or less. This may be due to my recently acquired habit of charging it every night. It must be charged to 100% no matter what when it's in the dock. information and advice about turning of device while charging is from this site. The buyer of a historical Lenox building, Bitcoin tycoon Ryan Salame, already owns six downtown properties, including four restaurants. And in 1978 Stan Nowlan and Howard Heap published their report. I removed battery for a number of hours. For the 70% of equipment which has a constant probability of failure, there is no point in doing time-based life-renewal tasks like servicing or replacement. Like your comparison of a normal van vs an ambulance. But you could find yourself facing critical failures by ignoring this basic concept. Their results show that you must compromise between better battery longevity or a larger usable capacity in a battery. THERE IS NO COMPULSION !! Thus there appears to be no possible software means to control the battery's charge level in a Mac due to lack of hardware support. I made a IFTTT task to turn on my wemo switch when it hits 60%. They all discharge together. I've seen this habit destroy capacity very prematurely numerous times. Interracial Love 07/10/22: Ghost in the Tomb: 8 Part Series: Ghost in the Tomb Pt. Two great, neighbouring (and usually, warring) rugby nations, bound together in sporting disaster. but I had experienced I used my laptop hp mostly on AC . After 500-1000 full charges, you will be sick of the battery, given improved cells over time. It all depends on the quality and grade of the battery cells. after taking the battery apart disconnect all wires from the cells that go to the protection circuits. Should I consider returning the drill? Back then the batteries went from 100 to 70% over their lifespan, and more interesting, the estimated accumulated number of power cycles you would get (The product of the two first columns of fig 2, integrated from 100% to 70%) showed a substantially better usage at about 50% DoD vs 100% and 10% With the current the usability is best at 20% resp 10% for NMC resp LiPO4 So is it today better to do small DoD? Hi dear Erik The consequence of a leaking tank is severe if the tank contains a highly flammable liquid. The bad news is that nothing has changed in the Fed's monetary calculus, nor mine. Like everything else, battery technology will evolve by natural selection. The voltages of lithium iron phosphate and lithium titanate are lower and do not apply to the voltage references given. Excellent info on batteries, thanks to Battery University. The voltage should be set to the voltage written on the battery and the max current should be set to 5% of total capacity. Li Ion has a long shelf life, except if it is stored fully discharged. There are electronic control modules either in the battery pack or the charger that decide when the charge is complete. Thanks Peter Baillie. (times*capacity percentage) so all the charging method here giving the same amount of charge to use, but with diffrence in life expentancy. We have a new Macbook Pro and it gets warm when charging. Manufacturers take a conservative approach and specify the life of Li-ion in most consumer products as being between 300 and 500 discharge/charge cycles. What we need to realize is that the rules have changed. 05. Put off your computer and charge as usual to 100%. In both cases the equipment could be made from identical components. What should I do? (it charges OK when I am not using the computer). Learning how to be a well-rounded source of help. . I am just getting a BMW i3 (without backup generator) and am keen to maximise life and range. Cycling in mid-state-of-charge would have best longevity. I.e, if one cycle is defined as one discharge and recharge of the entire capacity of the battery (or, say, using 50% of the capacity twice), then I assume the correct way to interpret table 2 is that you get 300500 full cycles with a 100% DoD, but 600750 full cycles with a 50% DoD, right? Since it's an inductive charging, some part of it's energy it's released as heat (not used for charging) and I think it SHOULD affect the battery. Does it mean it's optimal to keep the charger plugged in all the time (since the more shallow the discharge, the better - so by extrapolation, the most shallow discharge - no discharge, would be the best). Naima, I use my laptop mostly at home. (Frankly this should have been implemented in all significant portable devices years ago.) I read the original version of this article (whose only table was the very enlightening Table 3) many years ago, thanks to the authors for updating it with more tables and very informative data. TINYpulse by Limeade18 W Mercer St Suite 100Seattle, WA 98119. I just purchased a 20v "professional" cordless drill/driver (Craftsman brand) from Sears at 60% off the original price. Placing laptops on blankets or beds can block the vents and overheat it further. Multi-cell batteries, such as in laptop computers, present more challenges. A proven approach to reduce your downtime by 90%. It's back to 98% - 100% - showing 8 or 9 hours work available in the battery (the 9-cell) During the day, I use the computer on battery, in sporadic intervals of half to 1 hours. 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