Sanyo PRO-200/ PRO-700 battery, Lithium Ion (Li-Ion), Standard capacity Battery.Aftermarket battery is rated at 850 mAh capacity, and makes a great performance boost for the Sanyo PRO-200/ PRO-700 cell phone. Powerful Lithium ion battery chemistry has no memory effect either! This standard duty battery gives great talk & standby times! Note that a new lithium ion battery's full capacity is only achieved after 2-3 complete charge and discharge cycles. Charge the initial 24-hour battery charge with the cell phone turned off. Our One year warranty is easier & faster than the factory warranty if you should need it!