Tenergy 3V RCR123A Rechargeable Li-ion Batteries Protected 6 Pcs with 2 -Slot Smart Battery Charger BATTERIES NOT COMPATIBLE WITH NETGEAR ARLO SECURITY CAMERAS. (For Arlo compatible batteries, go here: http://www.amazon.com/dp/B01MRKGS4K) PLEASE ALSO DO NOT USE WITH SUREFIRE FLASHLIGHTS OR E-CIGS. RCR123A are rechargeable batteries to replace general CR123A disposable one-time-use batteries. Li-ion rechargeable technology. RCR123A size batteries are commonly used for tactical LED flashlights (Olight, ITP, Nitecore, etc), dog collars, lasers, alarms, cameras, and many more. Save money and time: can be recharged for 300+ cycles. This will save you time and money of constantly rebuying disposable batteries each time you run out. Convenient charge package: comes with AC power plug, standard 12V car cigarette lighter plug, 6 total batteries, and the charger. Perfect charger and battery set to have for travel and overall convenience Safe li-ion charging: built-in IC microprocessor provides protection to your batteries with thermal protection, over-charge protection, short-circuit protection, electrical protection.