Originally Posted by rcmatt
we (actually the missus) have an 04 plus 8. Morgan installed a small powersport battery in the cramped space. as many of you know, to get that power into a small case the lead plates are thinner and so the blasted thing has a short life span (even on a trickle charger)

Anyone put in a lithium battery? I am looking at the antigravity AG-1601
https://antigravitybatteries.com/products/starter-batteries/small-case/ag-1601/

More likely to be the shaking and vibration that does for the battery. I would be inclined to try a gel or glass fibre battery with better vibe resistance rather than go expensive lithium.