My Samsung Galaxy A3's battery life drains really quickly. How can I stop this?

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My Samsung Galaxy A3's battery life drains really quickly.

My Samsung Galaxy A3's battery life drains really quickly.
In 10 minutes it will lose about 5% charge and its rally annoying. I have disabled amazon services, google now and deleted loads of apps, one thing I have downloaded is battery doctor, but I don't know if that is a huge scam.
Also, my power saving option in settings says that I have about 3 and a half hours on full charge but it runs out of charge in less that 3 hours!!
Also because its a Samsung A3 I can't just open the back because the back is fixed to the phone.
Please help me try to resolve this issue as it can get really annoying at times.
 

FionaKing

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Oct 17, 2015
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I have the same issue - only had my Galaxy A3 for a couple of months. I looked at my stats 25% is screen, 20 some operating system and the rest split. Twice today it has run out of battery! Help!!!