life is short and routine maintenance frequently
Standard battery forklift is composed of lead plates and lead oxide, the electrolyte is an aqueous solution of sulfuric acid. Its main advantage is that the voltage stability, cheap; drawback is the low specific energy (ie energy per kilogram of battery storage), life is short and routine maintenance frequently.
Its full name is dry charged lead-acid battery, its main feature is the negative plate has a higher storage post lifter ability, in a completely dry state, the resulting electricity can be saved in two years, when used, simply add the electrolysis fluid, etc. can be used over 20-30 minutes.
Maintenance-free batteries due to their advantages of structural electrolyte consumption is very small, in the life of the basic need to add distilled water. It also has shock, high electric pallet jack temperature, small size, low self-discharge characteristics. Battery life is generally twice the ordinary. Maintenance-free batteries on the market, there are two: the first one at the time of purchase disposable after use, do not need to add electrolyte maintenance (adding replenisher); another factory when the battery itself has added a good electrolyte and sealed users simply can not add supplementary liquid.