Old batteries drain fast. If phone is old, probably you can't even get a new battery
Your battery may be water damaged. Check to see if the battery has a red spot on it that indicates that it is water damaged. If this is the case then you may need to buy a new battery for your phone in order for it to keep its charge longer.
If the cell phone battery is more than 3 - 4 years old then the battery could be worn out.Rechargeable batteries have a finite number of charge and discharge cycles andwill lose their charge capacity over time, i.e. won't charge to 100% andgradually the charge reduces until the battery won't charge up at all. OR Thebattery shows a 100% charge but when the adapter is disconnected the batterydrops off to zero capacity in a very short time. If the battery drops to anunacceptable charge level then the battery needs to be replaced.
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