Tall Tubular Batteries
Life more than 6-8 years
The main advantage of a maintenance free battery is that the electrolyte inside is completely absorbed in the separator and does not require water to be added regular basis. It does not need regular maintenance or ventilation, and can resist different climates in a better way than flooded ones
Self-discharge is a phenomenon in batteries in which internal chemical reactions reduce the stored charge of the battery without any connection between the electrodes. Self-discharge decreases the shelf life of batteries and causes them to initially have less than a full charge when actually put to use.