Review on 2-Pack SNSYIY 3.7V 3600MAh USB Rechargeable Button Top Batteries For Klarus Flashlight (XT11X, XT11GT, XT30R.) by Jay Williamson

Great batteries, and USB charging option is handy.I tested these batteries for actual MAH value, as opposed to the value advertised.These batteries tested around 3100 to 3250MAH, which is fairly close to advertised MAH.These batteries are only slightly wider, but the length difference from negative end to button top, compared to non-USB port button top batteries, is reasonably substantial. If your device's battery compartments are spring loaded, or even slightly longer than typical, these batteries will fit just fine. If your compartment struggles at all with normal button top battery lengths, these batteries will not fit.These batteries are plenty powerful and support my outdoor cameras for a long time.