I have a small one too MrMetatarsal =( I filled the gap by squeezing down a 1liter oil bottle =p ( bodge it 'n' leg it ) Iv got twin subs, 3 amps and a bass cap with a screen too but iv never had a problem with this battery. If a battery is drained completely its next to impossible to recharge it again Check leads on the alternater or even test the alternator by driving with the battery terminal off ( after starting it of course ) tis how i discovered mine was dodgy. Have lights on and see if that dim and get brighter when revving. Or if uv a volt/amp meter test both battery and alternater whilst car is running. If to the top guys on here think this sounds a load of rubbish, im sowie, im still young and learning =p