I'm just working my way through the specs for the battery BAT212200080 (12V 22Ah) and it states 20h discharge time End Voltage = 10.8V but I'm not sure what the 100% refers to. Would it be best to use mode 6 on the BP65 which cuts off at 10.5V or should it ideally be mode 3 11.25V which is nearest 10.8V? I'm assuming, although it says "deep cycle" it still needs to be shutdown at 50% discharge as it's an SLA battery. Or can "deep cycle" batteries such as this be 100% discharged? Thanks for any advice.