Today, I did the second cut of the grass, with the little tractor mower. The grass, no doubt due to the dry weather, has grown very slowly this year. I checked the tractors battery, when I last got it out a few weeks ago, and it was almost totally flat, not enough in it, to crank it over, so I put it on charge, and was expecting to have to replace it, it seems to have recovered though - it started at the first pull today.
That's the second battery, I have had, which somehow miraculously resurrected itself this year. The other, one of the pair of batteries, in the stair lift. They were both new, but I managed to wreck one, leaving the lift, off charge. I replaced it with an almost dead battery, then put the first one on charge a few times. It eventually seemed to mostly recover.