Original fitted battery was 28 or 30 Ah, nut now hard to find (or not produced?) 45Ah is the smallest available now, and excellent for the R4.
PavelI buy whatever fits. In the UK the original battery is £35, but the battery supplied for the Austin Mini is the same specification just the terminals are reversed. That costs £20. Easy - turn the battery around and the terminals are at the correct ends.
Just need to be careful to get a battery with the bit at the bottom for the battery clamp.




