battery battery 12V/200AH colloid storage battery, solar battery is in the valve controlled sealed lead-acid battery technology based on to achieve a long service life. So 12V series of solar cell design life is 6 ~ 8 years (25 degrees C); 2V series of solar cell design life is 10 ~ 15 years (25 degrees). The grid self discharge less special lead calcium alloy, the self discharge to the minimum, can be stored for a long time.