Model Name: ORB-217C50 Capacity: 5000 mAH Output: 9A Compatibility Olight Seeker 2 (3000 lumens) Olight Seeker 2 Pro (3200 lumens) Olight M2R Pro (1800 lumens)Does it work with earlier versions of the models above? No. It is NOT compatible with the first generation of Seeker (also called R50) or Seeker Pro. It is also NOT compatible with M2R (1500 lumens) version.Does it work with any other flashlights or non-flashlight devices? No. It only works in the models in the compatibility list.Can it be charged in any external charger? No. 217C50 is a customized battery. It is designed to be only charged inside the flashlights using the Olight magnetic charging pad.