Lenmar Replacement Battery for AT&T - Lucent Technologies 84021 RadioShack 43-8025 Sony SPP-9104 SPP-A2470 SPP-A2740 SPP-A9171 SPP-S9000 SPP-S9001M SPP-S9101 Sprint 89336 Replaces OEM Sony BP-T31 Sprint 89336 Replaces Sony BPT-31 3.6V 800mAh Nickel-Cadmium 1 Year Warranty