PDA replacement battery for the O2 XP-04 provided by AtBatt.com is designed for the O2 Xda Stealth PDA. Amstron brand PDA batteries are designed to be 100% manufacturer compatible and to meet or exceed original specifications. • Chemistry: Li-Polymer • Rating: 3.7V 1330mAh • Dimensions (LxWxH): 2.61 x 2.00 x 0.26 in. • Warranty: 1 Year