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Replacement Lithium-ion, rechargeable 123A batteries are available separately. This battery is designed for use with Lezyne Mini Drive XL, and Mini Drive (2012) LED lights. Each battery comes in a machined aluminum tube with rubber end caps for storage and protection from moisture or grime until it is needed. 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. LIR 123A Lithium Ion rechargeable battery for use in the Mini Drive LED light. SPEC: 600 mAh, 3.7V, 2Amp.