Brand new business and high quality battery. It is specially made for Sony Ericsson K750, can not be used for other phones. It has adopted the imported Li-Ion cells or polymer Li-Ion cells which are safe and have stable performance. It has high capacity and supports long standby time. It is safe and reliable for choosing compound Li-Ion chip. Multiple guards against falsifications let it convenient and humanized for quality tracing. No mercury, lead, cadmium lights harmful substances containing, exactly made according to the environment requirements. Charging limited voltage: 4.2V. It can only be charged by the appointed chargers. Must be kept away from fire and humid environment.