BATTERY

SURYAS21

my newly bought acer nitro spin has battery wear % 26..is it good or bad..??

Sharanji

SURYAS21 

The only true test will be to monitor the wear level over several months of use. If it holds steady between 15%-20%, then it's probably nothing to worry about. If it continues wearing quickly, then the battery may have been damaged by the previous owner. (Measuring battery capacity and wear level is a bit of a black art, as it requires extremely accurate measurements of voltage. Things like discharge rate and temperature can drastically change the results, so a +/- 3% change in wear level day-to-day is not unusual.
Newer laptops are programmed not to fully charge nor discharge the battery in order to prevent wear and maintain battery longevity. 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. So the battery may be 4000 mAh when new, but the battery tells Windows it has 10% wear. This prevents Windows from charging it past 90%, thus preventing a deep cycle.
As a battery gets older, it loses capacity. 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%.
That said, battery wear is mostly caused by deep charge cycles. That is, charging to 100% and discharging to 0%. Shallow cycles (say, charging to 70% and discharging to 30% put almost no wear on the battery.
This is just one of the wear-prevention strategies out there, and I don't know if the Acer Nitro Spin is using it. So it could just be reporting a fake wear level to Windows. 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.
There’s no way to “overcharge” these batteries. When you get to 100% charge and leave your laptop plugged in, the charger will stop charging the battery. The laptop will just run directly off the power cable. After the battery discharges a bit, the charger will kick into gear again and top the battery off. There’s no risk of damaging the battery by charging it over its capacity.  

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