How much is my iPhone 4 worth if the battery needs replacing?

I've had an iPhone 4 which I think is 16gb for nearly 2 years which I had bought for me second hand in excellent condition. I'm looking to sell it as the battery has become useless and needs to constantly be on charge for it to work and I'd rather upgrade to an iPhone 5 instead of pay out for the replacement. Other than the battery needing replacing it is still in good condition with just very light marks of use. How much should I be selling it for? Don't have a clue!

You could buy a new battery for it for like 15 bucks off amazon and put it in yourself. It's not hard to do there's just two little screws and they have YouTube videos to do it. You would be able to get more money for it if you do that or if you wanna just keep the phone now that the battery is working.

You can get a new standard battery with the tools needed to replace it for a fiver on ebay.
An extra high capacity one is a about a tenner.

The battery is about the easiest job in the phone, a few small screws and the old one 'peels' out (it's on double-sides sticky tape.).

Being able to sell it with a new battery makes it worth a decent amount of money - if you even still want to sell it!

Examples:
http://www.ebay.co.uk/...0829250872
http://www.ebay.co.uk/...0940949709

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