>>>>>Why 16650? Odd size… Typically for 2xCR123 replacement one can use a good 17650 or 17670.
Because of this:
Monsieur HKJ says:
“This battery is a 16650, i.e. it the diameter is less than 18650 batteries, this makes it a good battery for 2xCR123 substitution in lights that are to tight for a 18650.
To get the full capacity from the battery it must be charged with a 4.3 volt charger.”
I better stop answering my own posts … Starting to look weird.