Glad you got it fixed.
I did the same thing, exchanged the scooter battery with a riding lawnmower battery, about 4x bigger and cheaper. The system has been handling it just fine for some 8 years. There was a big controversy on a long gone forum dedicated for ASW. Some claimed the system couldn't handle it, some even said the system required a trickle charger as routine. I didn't need a charger.
I went through the LSM manuals. The electrical upgrade was for 2011 models so you probably have the HO (high output?) version.
From what I can tell it was a change from a 7+1 pole, single phase, full wave (mine)to a three phase system. You can confirm by looking at the wires coming off the stator lighting coil. A white + yellow + green would be the old single phase and three yellows would be the three phase HO
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