I have dealt with these batteries before and even gotten the sleeves for my -026 base and it did NOT work. I had to get a specific base that came with the sleeve. Mine ends in -016 and will charge those batteries. The fine print in the service manual states that while it claims to be a "tri-chem" charger, there are two models. One for NiMh/NiCd and one for LiIon. See the attached image right from the manual.
That convoluted mess is one of the big reasons I avoided those particular batteries like the plague, I went with the Honeywell LiPo batteries and charger (35 bucks and it is actually a tri-chem charger) and haven't looked back. Funny enough, there was a guy selling the unicorn chargers at Dayton last year for 15 a pop, I thought about buying a few just in case.