The Alfa WiFi Camp Pro 2 Mini works...
The Battery Acebeam size 21700 takes top button, is protected and delivers up to 5100mAh
This rechargeable Battery pack micro-USB 21700 5100mAh used for low current, USB two-way connection Battery Acebeam IMR 21700 3.7 V 5100mAh capacity
The lithium battery IMALENT MRB-217P50 is a new battery SIZE 21700 WITH 5000MAH of capacity, developed for the new flashlights Imalent DM70 and DM35.
Dimensions: 71 mm (L) x 21 mm (D)