I would imagine derp could learn a bit from someone who is retarded, like how to treat others. Somebody suggested 10% to indicate a deeper discharge in an effort to calibrate the battery but that is different subject altogether which your new battery will not require now. The figure 6 doesn’t show any result tested below 25%. LiFePO4 is the variant that was the basis for the late great A123 Systems battery company, who were anxiously working to get into the electric car industry in a big way, before they went down and were acquired by a Chinese company (not sure it’s a done deal yet). This, however, does not fully utilize the battery. For a 1.6Ah battery, C = 1.6A. After discharge the battery should be fully charged back because, 2.Prolonged discharge state of the plate causes sulphation, 3. and what should be the minimum amount to which we are suppose to drain battery to prolong its life, Dear Mohamed ,  no minimum amount requirement, for example, 10% discharge is not equal to one full discharge, and 10 times 10% discharge is equal to one full discharge. Patrick, ..but he came over as a an obnoxious braggart. There was no big difference between 1C and 2C and the batteries lasted about 7 000 cycles. That’s in the same general ballpark. We will do full charge and discharge to a certain level or always keep in AC power. I just bought an expensive Li-ion powered car (no gas, only battery powered). Please let me know if I used anything incorrectly. The question is asked, “Should I disconnect my laptop from the power grid when not in use?” Under normal circumstances this should not be necessary because charging stops when the Li-ion battery is full. If you want to do the best you can to prolong the overall battery-life of your powerbank, then yes. I believe the misunderstanding may lie in the definition of a cycle; even the author points out that there is disagreement among experts. also, please give us info and any valid link about delivering power separately to the rest of the system while charging li-ion battery. I know its inacurrate at best - BUT on this page; http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries I pretty much use it as a desktop. So if I understand the Table 2 correctly, the optimal capacity to charge a Li-ion battery is 50% ? *How. I must say the Galaxy S3 battery must be leaps and bounds ahead of the information here and on wikipedia. This has been the driving force over the last 40 years in an industry that is 130 years old. You can time this & then use a timer to tell you when to shut it off. What I noticed is that if I put the battery again after a few days the charge had lowered to 30% for example. I basically did a full charge, waited for about 5 minutes, pulled out the battery and measured with my multimeter. At 30mW charge the battery still had a cell voltage of 9.6V and thus was way above what would qualify for a deep discharge. So, even if the words you laid in my mouth were actually uttered by me, I’d still be right due to the fact that you didn’t analyze what you argued with. Jeff, I think it is just stated to be equivalent for practical purposes because it is close enough. You are definitely right in this regard that it is problematic but it is not limited to lithium. I just purchased a Makita 18 volt sub-compact Drill/Driver and impact drill kit. Matt J., you just have to have confidence on the Charger which comes with the Computer. Details . 50% * 1500 cycles = 750 times full capacity Is it worse for a lithium polymer battery (phone or laptop) to be charged while the device is on? I have read that partial discharges are the best for longevity of the battery. I also wanted to express my gratitude on the information given about lithium based batteries. The largest capacity loss occurs when discharging a fully charged Li-ion to 25 percent SoC (black); the loss would be higher if fully discharged. I think there ais a big misunderstanding when we try to select the best choice for charging cycle of our litium batteries. I understand keeping it between 80%-40% is probably ideal but for this kind of device it isn’t really doable without large disruptions to the experience. My first cell phone would run 13 to 14 days continuously per charge for nearly 10 years using this rule. Question: In table 2, the cycles and DoD relationship seem to imply that 50% discharge is ideal. My compromise work routine uses the Li-battery for my working day, and I charge it overnight. I’ve a questionabout that doubling of lifetime for each 0.1/V lower top voltage. The other vendors need to open their eyes and tend to their tardy homework. I extrapolated graphically the data from Figure 6 to more cycles using an intrapolation/extrapolation program with default settings assuming there’s a linear decay of the capacity retention with the number of cycles: If so it can be expected a drop of battery capacity retention to 75% after 13000 cycles in the “75%-25%” scenario, drop to 70% after 11000 cycles in the “85%-25%” scenario and, the worst case, drop to 70% at about 7000 cycles when using 100%-25% scenario.
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