what the red and green meter for on the front?
ok, the charge Indicator lights...cool., not really a meter...no biggie...
the red light is to let you know you have full charge...with the M148 turned on and NOT connected to charger, you push the charge indicator switch, the red and green lights will come on if you have full charge. if only the green comes on, then you have sufficent charge but not a fully charged battery. no lights, no charge.
hope this helps
peace
jah
edit...OBTW, the amber light on the back of the M148 is to let you know the internal charger is working......