The battery on my VT1100 went caput a month ago, so i replaced it with thesame size one. This was a huge old open cell battery. Because i think it was old stock, the bike has stopped again. I recharged it and its not holding charge. Definately the battery. So anyway i want to put a more modern battery in to get closed cell etc. The space is huge so i should be able to squeeze quite a few different batteries in. Obviously need to buy a 12v. Is there any other spec that i need? Like watts?