Hannes,
Perhaps not "sure fire" but it would defintely increase your chance of failed reflash.
Preprogramming/flash requires a clean power supply with adequate voltage. A fully charged car battery or a regulated power supply will give you that.
Depending on the battery charger you will get either a poorly regulated, noisy supply, or using more advanced chargers the potential for the charger to switch between charging stages while you are reflashing the ECU.
These factors will increase the chances of a failed reflash. You are better off either using a dedicated supply, or recharging the main battery before attempting to reflash if the voltage appears low.
cheers
Paul



				
				
				
					
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