Lenmar Cell Phone Battery for Sony Ericsson W200a, W200i, Z310/a, and Z550a Series Fits Sony Ericsson J300, Sony Ericsson J300a, Sony Ericsson J300c (See description for additional Cell Phone Model fits) Replaces Sony Ericsson BST-36 3.6 Volts, 750mAh Capacity Lithium-Ion 2 Year Warranty