i have seen these in the past but cannot find a source now.would be perfect for my versapak conversions if a good quality high rate cell with decent capacity exists.
just did some with he4 as they were cheap.while many of the versapak tools do fine on laptop grade cells some really push the batteries.esp the wizard.under load it trips the ptc on laptop pulls.
They just don’t exist anymore. I’ve looked for years for these and 25500 to replace triple aaa and aa holders for quick boost to run times for cheap lights. Every time google or any other search gets close it’s a 18650 or 26650. They probably existed once and that’s why all of our chargers list them but no any more.
i can find them in lifepo4.
but not in the 3.7 v common type.
extinct.