The Rechargeable Li-Ion 18650-A Battery from Tovatec has an output power of 3.7V, a 2600mAh capacity, and a 9.62Wh rating. A built-in protection circuit prevents excessive voltage and charge/discharge currents while helping to prevent short-circuiting. Also, the battery is compatible with the T1000S, T1000V, and ST2000 II dive lights.