http://www.kingwellbattery.com/products/cylindrical-polymer-cell.htm
Features:
1) High operating voltage (3.7V).
2) High Energy Density. Advanced technology provides ultra-high capacity performance Lithium ion Polymer batteries.
3) Wide Operating Temperature Range. Lipo rechargeable batteries can be charged over a temperature range of 0°C to 45°C, and discharged between -20°C to 60°C.
4) Designed for Safe Operation. All batteries are equipped with multiple safety features, including safe shut-down separator and safety vent.