Join Date: Oct 2015
Model: GL1500SE Euro Spec
I have been using the bike with that modification for 3 years without any problems and even with a regular lead acid battery.
I had tried once at a very low voltage when dealing with headlight adjustment (unfortunately I didn't measure the voltage, but the bike was barely cranking) and it had started easily.
So I can say that, with this modification, if the engine will crank it will start.