 When working a discharge cycle, a LA battery should be kept at a depth of discharge (DOD) of less than 50%, ideally no more than 20-40% DOD; a true LA deep-cycle battery can be taken to a lower DOD (even an occasional 80%), but these greater DOD cycles always impose a longevity price.Lead acid battery lifetime cycles will vary with the care given, with best care they may achieve 500 to 1000 cycles.With less careful use, a lifetime as few as 100 cycles might be expected (all dependent upon the use environment too).