The easiest way is not keeping it plugged in all the time:
Cadex Electronics CEO Isidor Buchmann told WIRED that ideally everyone would charge their batteries to 80 percent then let them drain to about 40 percent. This will prolong the life of your battery â€” in some cases by as much as four times. The reason is that each cell in a lithium-polymer battery is charged to a voltage level. The higher the charge percentage, the higher the voltage level. The more voltage a cell has to store, the more stress itâ€™s put under. That stress leads to fewer discharge cycles. 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.
My Lenovo has a setting that, even when plugged in, lets the battery drain down to a certain level and then recharges it to a not-100% one. I’ve been using that and wondering why. Now, I know. There are other settings, of course, that keep it at 100% if you know you’re going to be unplugged for a long time.
Other advice from the article: Don’t keep your laptop on your lap all the time. Heat is an enemy of batteries.
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