Frank90, I have a Trimax SM2200 and re charging - just charge it (which can take 2-3 hours) until the Light Indicator shows a full charge. That is: Green Light indicates the unit is charging, and Red Light shows it is fully charged. I'm not too sure about your first question except to say when the unit is fully charged I've never had a problem losing power when outside with the Sat Meter at the Dish.