Amprobe BR-7000-T Rechargeable LI-ION Battery for AT-7000-T Transmitter Rechargeable 7.2V, 2.2 AH Li-Ion battery Boosts signal for improved results in energized & de-energized (open) tracing and in Clamp mode Automatically begins recharging when the AT-7000-T transmitter is plugged into an energized circuit Provide 10 hours of operation Accessory for AT-7000-T Transmitter (included in the AT-7030 kit, optional for AT-7020 kit)