I use Nitecore batteries, no issue with the fit in Malkoff or Solarforce hosts.
What's a reasonable price for one?
Does the protection battery have a different name such as ncr18650b?
Vapers are buying them up....seemingly as fast as they can be stocked by a vendor!!(Noticed you sig....As a fellow vaper, I sympathize.....!!)I like the IMR sony VTC5. they are hard to get at the moment though
The NCR18650, NCR18650A, NCR18650B, NCR18650... is the Panasonic name for their cells. The guy adding the protection can use the same name or make a new name.
Remember protection is never made by Panasonic, but always by somebody else and some of these guys wants to be anonymous.