Help Needed with a Laptop Battery?

I have a 05 Gateway laptop computer. A yr ago my original battery charger that came with the computer finally gave out due 2 accidental damages (the cord being thrown/moved around, me tripping over & yanking the cord out of the outlet, etc). I kno that sounds careless but it WAS an accident. We called Gateway & had it replaced for free since the warranty was still in effect 4 like 2 more wks. We got the new battery & it lasted the next yr up until about 3 wks ago or less. This time the actual charger plug was pushed all the way inside of the box. I paid for the 2nd 1 & it didnt work. So I figured it was the inside of the computer that was broken. Yesterday I defragged my computer & the charger miraculously began 2 work. BUT now it wont hold a charge as in as soon as i unplug the cord it says its down to 10% & i gotta wrap it & angle it like i did the old 1 @ the end when it was dulling out. y isnt my new 1 holding a charge? It says its charging but nvr changes. How do i make it work?