v tech 80-5461-00-00 cordless phone battery ni-mh, 1.2 volt, 2600 mah - ultra hi-capacity - replacement for sony bp-t31 rechargeable batteryEM-NMH-2/AA - Ni-MH, 1.2 Volt, 2600 mAh, Ultra Hi-Capacity Battery - Replacement Battery for Sony BP-T31 Cordless Phone Battery