The reason they cite a 50 charge level as good is this puts the least strain on the battery by having half the lithium ions in the lithium cobalt oxide layer and the other half in the graphite layer. For example, Battery University states that a battery charged to 100 percent will have only 300-500 discharge cycles, while a battery charged to 70 percent will get 1,200-2,000 discharge cycles. Apple gives an estimate for the number of cycles, but your own use of the battery determines the actual number of cycles your battery will have. ![]() That stress leads to fewer discharge cycles. The more voltage a cell has to store, the more stress it's put under. The higher the charge percentage, the higher the voltage level. The reason is that each cell in a lithium-polymer battery is charged to a voltage level. This will prolong the life of your battery - in some cases by as much as four times. In fact, you should unplug it before that.Ĭadex Electronics CEO Isidor Buchmann told WIRED that ideally everyone would charge their batteries to 80 percent then let them drain to about 40 percent. ![]() In order to squeeze as much life out of your lithium-polymer battery, once your laptop hits 100 percent, unplug it. ![]() But if you're like most people, you probably keep yours plugged in when you're at work or home. We use them to work and play from anywhere in the world. Laptops are our indispensable lifeline to the majesty that is the Internet.
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