My 75 amp leisure battery which I’d had for 18 months (which used to last for 2-3 days) started going ‘flat’ after 2-3 hours – so I went and bought another!
Just about to take it to the tip/recycling centre, when I noticed a label on the top face, next to a small plastic ‘viewing window/battery condition indicator’.
It said - Green: fully charged; Black: discharged; White: LOW FLUID LEVEL.
I unscrewed the caps to each cell and there was no water in any of them.
After filling them up, and recharging, the battery is working perfectly again!
Next time, I’ll get a ‘maintenance-free’ one – if I ever need another!.