I am wondering if anyone has any issues with the NiteCore 21700 (NL2150 or NL2150HP) batteries that Backscatter used to recommend for the MW4300 light? the other day I was prepping for a dive and I noticed that the NL2150 batteries were larger than the NL2150HP batteries, large enough that they did not fit into the MW4300 light. I'm now noticing that Backscatter is offering the XTAR brand batteries with the MW4300 light and MF1 strobe.
So I went to the shop where I bought the light and batteries from. They informed me that they also noticed that the batteries were a larger diameter than they were in the past. Apparently NiteCore had 2 batteries NL2150 and NL2150HP (HP being high power discharge). NiteCore was able to make the NL2150 match the specs of the NL2150HP by increasing the diameter of the NL2150 ever so slightly. But that change makes the NiteCore NL2150 battery no longer fit the MW4300 battery slots. The scuba shop exchanged the NiteCore brand for the XTAR brand batteries with out a question after explaining the design changes of the NiteCore to me.
This is the kind of service that keeps me coming back to smaller brick and mortar shop instead of large internet sites.
The 21700-size battery is also made by Klarus, AceBeam, Molicel, Samsung, Lyshen, Epoch, OLite, Sony-Murata, and others, so that you have a number of alternatives to avoid being caught off base by the inconsistent size of NiteCore batteries.