I got tired of the battery and the mess in the trunk of my 1974 MGB. Kind of a pain behind the seat too. I decided to give this AGM battery out of my 1984 Goldwing motorcycle a try. 350cca 21ah battery, it starts very well. So far I am very pleased with the results. I glued a rubber pad behind and underneath the battery and secure it with a heavy duty rubber tarp strap.It doesn't move. Plenty of room and easy to get to. Only time will tell if it will last.