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i replaced he battery cause it wasnt charging past 50% and not lasting but now its sort of stuck in a loop of showing battery charging then flicks to apple logo then just keeps looping been on charge for 2 hours and its not showing anything more than a tiny red bar on the b b. help attery

will buck, check with your old battery and see if that behavior is the same. It is possible that you have a bad APN number battery. The other thing you want to do is to make sure that your dock connector does not have any broken, bend or corroded pins, clean it with some isopropyl alcohol and a few puffs of compressed air. If that does not help, I would proceed with one more new battery and then a new dock connector. Hope this helps, good luck.