I am using a Samsung Galaxy Core prime for about 3 years. The problem is that firstly, it gets charged very slowly (takes 7-8 hours to get fully charged) after that battery backup is fine, nothing unusual happens. But suppose if I charged my phone up to 65% at 9pm and when I see my phone in morning it automatically gets reduced to 32% or when at night it is 27% in morning it will be only 2%. What is happening? Will battery replacement be the solution?

  • Mobile phone questions are off-topic here at superuser.
    – n8te
    Jul 5, 2017 at 10:00
  • 1
    So on which site I should ask?
    – daya
    Jul 5, 2017 at 10:00
  • I'm not convinced the quality of this question is good enough to be migrated
    – Dave
    Jul 5, 2017 at 10:05
  • 1
    What do you mean by 'quality'? I am just asking a simple question.
    – daya
    Jul 5, 2017 at 10:08
  • Backup your data and do a factory reset. Also try a different charger. If that doesn't work, you probably have a bad battery but they at least on this model they can be replaced and are relatively cheap.
    – James
    Jul 5, 2017 at 10:13

1 Answer 1


First, it may sound redundant, but restart your phone.

After restarting if the issue persists then do the following:

So, to diagnose the issue with your battery, first you need to find out if there is an app running in the background which is draining the battery. To check this visit this site:

In all versions of Android, hit Settings > Device > Battery or Settings > Power > Battery Use to see a list of all apps and how much battery power they're using. If an app you don't use often seems to take up a disproportionate amount of power, consider uninstalling it.
On Android 7, here you can also see how much “Cell standby” or “Mobile standby” is eating up – this is the amount of power your phone gobbles up while not being used.

After follwing the above instructions, if your battery is still draining I would take it to a service store to get the battery tested and then you can find out if you need a battery replacement or the issue lies somewhere else within the phone hardware or software.

Sometimes a dead giveaway for a faulty battery is that as soon as you plug the phone in for charging, the battery percentage "jumps" for example from 6% to 25%. If this is occurring, you for sure need a new battery.

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