olymer battery technical parameters (specifically can be designed according to customer requirements-voltage/capacity/size/line) Product model: XL 500mAh 3.7V Single battery model: 602535 Single battery voltage: 3.7V Single battery capacity: 500mAh Battery voltage range after combination: 3.0V~4.2V Battery pack power: 1.85Wh Battery pack size:6*25.5*38mm Charge and discharge times: >500 times