I replaced a Tucson and Ranger battery afterwards it had a CEL w/c I have to flush using an OBD scanner. From then, I always use the OBD port pin# 16to inject an external 12VDC whenever I replace a battery.

obd.jpg

I even jump-started an innova using 6Ah Makita 18V battery, no probs whatsover. The starter could operate from as low as 7V to 24V, the electronics are much the same with built in filters to tolerate the wide voltage range.These automotive electronics are designed to handle double its voltage arnd 24 volts, higher than that like voltage spike more than 24V like due to a busted Alternator regulator then its a fried electronics.

My 7-stage charger with its 1st stage as desulfator-works by injecting around 17V and high frequency to remove the sulfates accumulated in the plates, i could even see and hear the inside of the battery boiling during this process. No harm made on the ECU and accessories I just make sure the car is on idle/sleep mode.
des.jpg