200pcs Maxell LR44 1.5V Alkaline Cell Battery (One-Box-Set) by Maxell

 This is a 1.5 volt alkaline button cell battery commonly used in laser  pointers watches children books calculators and medical devices. A  button cell battery is a small round battery that is 11.6 mm (0.457  inch) in diameter and 5.4mm (0.21 inch) thick. An alkaline battery is a  battery that uses manganese dioxide and zinc to create a reaction and it  is an economical alternative to silver oxide batteries while still  providing high capacity and long usage. This is a primary cell battery  and it is non-rechargeable. This alkaline button cell battery provides  long power life and excellent continuous power sources to your device.  Works effectively in both low and high temperature.