Why wont my iPod charge

Why wont my iPod charge Hello my ipod classic 4th gen 40gb will not charge in the house, or do anything(it has a blank screen after a battery replacement) I just get a battery indicator with a battery symbol stuck, unless it's in the car then it can. Charge enoguh to go into disk mode, but turns off immediately afterwards, any help would be greatly appreciated thank you ANSWERS:
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