There is a new review on Fenix ARB-L2 rechargeable Li-ion battery - 18650, 2600m...
Stick With The Name Brands, Not Knock-off's.
Great price and service from Shaologear. Excellent rechargeable battery, holds a charge for a long nights use or on standby for days. I prefer the single 18650 vs. 2 CR123's to power my Fenix PD32UE and PD35.