Replacement Lithium-Ion, rechargeable proprietary 2 cell battery. This battery is designed for use with the Lezyne Mega Drive LED light. All Lezyne batteries are quality tested for capacity and performance before leaving Lezyne's factory. To get the best performance out of Lezyne LED lights, we recommend only using Lezyne batteries.
SPEC: 5200 mAh, 3.7V, 2Amp.