Despite it's comparativley modest charge current, the 3-stage characteristic of this charger will still deliver the energy necessary to fully re-charge and maintain moderately sized batteries within a reasonably short period of time.

The charger outputs a constant charge current of 500mA until the charge voltage has climbed to 14.7V (6.9V for 6V-batteries). Starting from there, the Charge voltage is now being held constant for about 120 minutes, allowing the charge current to gradually decay to a small "trickle" current towards the end of this timed period. at this time the battery is full.

At this point the device steps down it's charge voltage to 13.8V (6.9V for 6V-batteries), float-charging the battery with a small trickle current to compensate for it's self discharge, a condition inherent to all batteries.

The 3 charge phases are being indicated by distinctly coloured LED:
- Red for "Boost Phase"(Constant Current)
- Amber for "Timer Phase"
- Green for "Float Phase"

Device is automatically protected when: