My iphone 4 won't go past 15%?

I finally got my phone to charge but it is being really slow and now it won't go past 15%. It will even start going to 14%. How can I get it to charge faster and get past 15%? I'm going somewhere later and would like to bring my phone.

It's likely that the battery is losing capacity, can't hold a charge anymore. Replacing an iPhone 4 battery isn't too difficult, so I'd recommend buying a new battery for it if the phone is still of any value to you.

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