Banner Batteries (Made in Austria) are invariably rated as being the best leisure batteries. They aren't cheap but they are superb. I charge up every night on a smart charger - no onboard charging at the moment for me.
I bought a 2/hand Banner one for £7.50 (135a/h) two years ago when it was supposedly dead from a garage. Put it on a smart charger over the weekend and used it to pump 600 litres of water the next day and then charged it at 4 a/h over night (15 hours) and it was ready by the next day for another 600L.
It is now getting a bit tired but as I work alone now I only need 400L a day and it still copes. I can't be certain but I think it is about 6 years old.
I will undoubtedly buy a brand new one even though it will cost about 25% more than other batteries of the same nominal rating.
