Yup, use a Dapter. The Chamaleon is designed to switch off when the voltage starts dropping when NiCads are fully charged. This never happens on Lithiums - the voltage keeps on going up.

So the Chamaleon would just be used as a high-voltage, current-limited supply. It jacks up a standard 12V power supply to around 60 Volts.

And the Dapter will switch off when you reach 3.7 Volts per cell.

John