Originally Posted by
Aushiker
Having had the pleasure of a flat battery after three days camping, the battery was dead enough that my jump starter, an ITechWorld, wouldn't kick it over. I have since learnt (thanks, YouTube) that disconnecting the battery and then connecting the jump starter battery directly to the cables gets around the battery issue. ....
If you try that, be careful that the engine is never running with no battery connected. Any voltage spikes could play havoc with your electronics.
Keep your starter battery connected while you attach the cables to the vehicle battery.