A spare rechargeable battery for the Ledlenser P17R torch, supplied ready-fitted in a battery tube with rear cap, so a flat pack can be swapped for a charged one quickly. The P17R is powered by Ledlenser's Safety Ytrion Cell, a lithium-ion cell technology the maker rates for more than 5,000 charge cycles without notable loss of capacity. Packed in a black poly bag (no retail box). We could not find the maker's own specifications for this spare part, so confirm that your torch is a P17R (not the newer P17R Core) before ordering.