The MST-09 Electric Bottle water pump is different from other normal rechargeable type. It is without battery inside, but could be with 2pcs of D type battery, and long time working 100% brand new and high quality. It is a good replacement for your home-use top load dispenser, it is lightweight, compact, easy-to-operate.   The Battery bottle pump power by: 2 x"D" size dry cell batteries will last for 8 to 10 months. (based on 5 gallons per week usage) able to gallons (1000 liters) when used continuously.