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Solve : suggestion about laptop battery?

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i just bought acer aspire 4920 second hand , and the battery LAST about 1 hours and 30 minutes or more than 1 hour.
I plan to USE the laptop for downloading overnight and keep charging , will it cause the battery die faster ?
or is there any tool that can prevent charging after 100% and continue charging after 20-30 % battery left ?
my town always have blackout, so i set it to hibernate after reach 20% battery.If it only lasts 1 to 1.5 hours it is nearly dead and you need not worry about damaging it. If you connect a laptop to AC power it will stop charging the battery when it is 100% charged.
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i just bought acer aspire 4920 second hand
That is what happens. Laptop batteries just do not last very long.
Salmon Trout is right. Don't worry about nit. The battery is over the hill. okay, but that man give me 1 more EXTRA battery, 1 last for 1.5 hours and another one last only 30 minutes 
if i don't use the other 1 battery for 1-2 months it's gonna die too ?
the new one battery last for how MANY hours ?
which battery i should use ?  Obviously the one which gives more backup.


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