Those batteries were originally meant to be used with the XG-100P,which is why they fit it's dedicated charger.
There are some after market chargers like Endura (plus a clone version) and a Honeywell/GTS version that have cups that will fit the extra "fins" on those batteries.
I believe there was only ever one particular type of lithium ion battery made that actually worked with the M/A-Com/HARRIS Tri-Chem chargers and those have long been out of production.