Mugen Power 1100mAh Battery for IPAQ 4100 & RX1950 Series PDA's/PPC's 100% Brand New High Quality non-OEM Li-Ion Standard Battery. One-Year manufacturer's warranty! Latest Lithium Ion battery technology gives the best performance possible compared to other battery technologies. Manufactured by Mugen Power which means Quality! Amperage: 1100mAh; Voltage: 3.7v