Im new to the whole led thing and love this site. My first real led purchase will be a Ultra Fire Wf-502b and Uf-H3 and will be used for work. I will using a miller ml-101, a generic 3.1 dual usb 12v car port to charge the cells and want 4 cells that wont kill me and work in both flashlights. in the mean time i will keep reading to help me farther understand the whole battery deal. Thanks for all your help.
Just buy them you wont b dissapointed Dont know anything about your charger ,but if its a decent one you should have no problems as long as you check voltages of batts before and after charging.
Several reports indicate those cells are good. I have the unprotected UR18650ZTs, no experience with the FMs.
I hear the I4 is a good choice for a charger too.
BTW, Welcome to BLF! If you plan on sticking around here, get some extra batteries; you’ll soon have a lot more flashlights