(Measuring battery capacity and wear level is a bit of a black art, as it requires extremely accurate measurements of voltage. If it continues wearing quickly, then the battery may have been damaged by the previous owner. If it holds steady between 15%-20%, then it's probably nothing to worry about. The only true test will be to monitor the wear level over several months of use. OTOH if the original owner let the battery discharge completely and left it that way, it may have self-discharged past 0% enough to damage the battery and the reported wear level may be accurate. So it could just be reporting a fake wear level to Windows. This is just one of the wear-prevention strategies out there, and I don't know if the Acer Nitro AN515-42 is using it. This prevents Windows from charging it past 90%, thus preventing a deep cycle. So the battery may be 4000 mAh when new, but the battery tells Windows it has 10% wear. One of the ways I've seen some devices do this is by "faking out" Windows into thinking the battery has more wear than it really does. Newer laptops are programmed not to fully charge nor discharge the battery in order to prevent wear and maintain battery longevity. Shallow cycles (say, charging to 70% and discharging to 30% put almost no wear on the battery. That is, charging to 100% and discharging to 0%. That said, battery wear is mostly caused by deep charge cycles. If the battery's capacity when new was 4000 mAh, and its current capacity is only 3600 mAh (90% of new), then it has a battery wear level of 10%. As a battery gets older, it loses capacity.
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