Burnt out two 9v batteries on my dvom already, all I can think of is there is an anomally in the voltage control module since changing batteries. The T1 does not let you register a new battery, so I think the module is seeing the old battery values (the battery was 15 years old, but I changed it on a whim not because it was dead); 12 volts are a nominal value but amps matter to the EMU and module boards as they cause heat and disruption to circuits. The original g8 batteries are no longer available except from dealerships 300euros+, but those are questionable as varta stopped producing them in 2020, not sure dealers are gonna keep them 100% viable for 2-3 years. Anyway, still cannot see how i=vr can produce 18+v from 12v without adding additional circuitry that is no apparent in the wiring schematics.
More trials tomorrow, enjoy your weekend.