Charging

More batteries are damaged and prone to premature failure due to improper charging and overcharging than by any other means. If batteries are charged at a constant amperage and low voltage, charging time is significantly longer and battery capacity is effectively reduced because the battery is never completely recharged. To avoid this many individuals opt for a higher charging voltage, which accelerates the rate of charge but can ultimately harm the battery if the charge is continued for any length of time after the battery reaches capacity. The best charging solution is a multi-stage charge regulator that keeps recharging time to a minimum (higher voltage) but prevents battery damage caused by overcharging (automated charge regulation).

Discharging

Discharging marine batteries to 50% of capacity in the general rule for obtaining optimal battery life. This provides the best compromise between available energy and the number of discharge cycles a battery can provide during its lifetime. If a marine battery is continually discharged below 50% of it's capacity it leads to a shorter battery life due to sulfating (a chemical reaction inside the battery that limits the ability for it to hold a charge).