Ericsson BST-30 Replacement Battery by Amstron is designed for use with Ericsson K700i, T220, T226, T230, and Z200 cell phone models. Amstron cell phone batteries are precision-engineered and rigorously tested for voltage, capacity, compatibility, and safety to exceed original equipment manufacturer specifications. • Chemistry: Li-Ion • Ratings 3.7 Volts 670mAh Capacity • Warranty: 4 Years