Physical dimensions limit the capacity. There’s a thread on dellmasives how I done it in relation to upgrading the battery and the max dimensions. Mine is definitely a squeeze.Thanks chaps, good call and might come to that, will let the converter check it out first though as it’s still under warranty. Keen to find if there is something causing a drain as that would affect a new battery too. Any recommendations for a brand of agm battery and is it a case of the largest capacity that can fit? Current Moll is 70 ah, 95 seems like a decent upgrade, what sets the upper limit on capacity?