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The M2R Warrior Pro is the newest version of OLIGHT two-button straight tactical flashlight. It features a single 5000mAh 21700 chargeable lithium battery and TIR lens for uniform light. The maximum output and distance are increased by 20% and 44% separately, reaching 1800 lumens and 300 meters. The surface texture is improved to the second-generation multifunctional tail with strengthened connective magnetism. Newly designed magnetic USB charging wire can hold 2A current, increasing charge rate 100%. With its lanyard hole, detached two-way Stainless Steel Pocket Clip, flashlight bag, the M2R Pro is the next evolution of the tactical flashlight.
That is absolute BS! We were told in the FB group that it would work with a non-proprietary battery, as does the Seeker Pro. Not only did I already order the light, I also ordered a non Olight 21700.
Short version: The battery goes in the other way around than in the Seeker 2 Pro. They seem to use the Plus and the proprietary Minus to drive the light for the M2R Pro. They used the regular Minus to drive the light in the Seeker 2 Pro.
Regarding the regular M2R: This light is constructed COMPLETELY differently, and has an inner tube (like the FW3A or Klarus lights) so it can use a standard 18650.