leisure batterys can not be left to run down to more than 40 % of there total charge or they will not recharge i killed a new 110 amp battery like this trouble is if you do short runs with a split charger all you do is top battery up so i use an 85 amp and charge every two days any one seen the leisure battery made with carbon fibre inside makers say it will do 800 deep cycle charges but have heard there customer service is naff so am loath to buy one