Does anyone know what cell the Cyansky BL1834U battery uses internally, or otherwise its detailed specs?

Sure thing! Please let us know how it goes, and if you think it’s proper, you can mention to them that I have asked you to help me with a review of the HS5R and its battery, to be published here in BLF, and that it would help a lot you having the same BL1834U battery that I do, so as to make sure that their flashlight doesn’t end up showing bad performance because of an inferior battery… :slight_smile: