Can also be used with the TM36, TM38 or TM39 (Unscrew the head from the light and charge through the NBP52/NBP68/NBP68HP battery directly). It is not compatible with the "LITE" model which uses 18650 batteries.
The rapid charger output voltage is 2V. The maximum charging voltage to the battery pack is 4V. Output voltage and charging voltage are two different concepts and should not be confused.