If u r cell showing charging indicator onscreen
and actualy it not charge battery,it means problem in charging ctrl ic check rasister near charging ic and finaly heat charging ic with using flux and hotair gun
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Most manufacturers recommend an overnite charge, but the power you require to recharge a phone is very minimal, so I would recomend at least 4 hours, unless the battery back up is new then you can charge your phone while charging the battery back up for the full 12 hrs.
The battery may be near the end of its usable life. As batteries age, they cannot store a charge as long as they used to. Also, if the battery is constantly being charged, this could cause the battery to lose its ability to keep a charge. The best option is to replace the battery.
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1st of all i'l suggest u to not to go to road side shops.cause they'l change ur battery even if it is ok.
to get full back up u should charge ur cell to full.it takes nearly 1 to 2 hrs.try not to use to many applications.n ya jus check ur user manual to ensure that how much back up time does it give actually.