Surefire is offering rechargable LFP 123A batteries. The kit includes 2 rechargeable batteries and one charger with appropriate cables. These betteries retain 50% of their original capacity even after 500 charges.
LFP battery's runtime is 50% less than the disposable ones, but maximum output levels are not affected. Only use for LED bulbs(no incandescent lamps) and do not mix with lithium 123As