In practice, all devices using Li-ion and Li-polymer batteries will benefit if the user observes the following:
- Keep the charge within 50-60%.
- If that's not possible or practical for you, at least keep the charge difference within 50%.*
- Do NOT fully drain the battery - doing so increases battery wear and may permanently damage the battery.
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*- For example, if your device is fully charged, charge it only when it reaches 50% so the drop in charge is 50% (100-50 = 50). Then, once it rises back up to say 60%, you can drain all the way down to 10% (60-50=10). The same goes for charging: if you happen to almost drain your battery to, say, 10%, the charge it up to 60% first (10+50 = 60), then let it drop to around 50-55%, then charge it up all the way to 100%. This practice reduces battery wear and will make your battery last for more than two years without noticeable drop in total capacity.