The internal rust-free calcium metal exhibits the excellent heat resistibility and the strong immunity against any drastic temperamental change. It is a maintenance free product which is sealed to prevent spillage. We recommend the following to increase the battery life: Don’t leave lights or accessories on. Drive your vehicle regularly to prevent it from losing its state of charge. Try to take a steady one hour drive each week. Keep your battery case clean. Battery terminals should be cleaned with a brush if necessary. Inspect the battery terminals regularly to ensure they haven’t loosened during driving vibration. Have your engine serviced regularly as poor engine condition can overload the battery.