Quote Originally Posted by 12vdc View Post
Then you will have to use another tool to avoid losing car electronics memory, or it may cause check engine light if the sensors are sensitive enough to detect delays in low voltages triggering a false alarm.

No harm done to all the vehicles I've charged with the 7-stage charger that comes built in automatic desulfator.
I don't think those chargers defaults to desulfation anyway, unless the charger logic deemed it necessary after assessing the battery's health. On some chargers, this mode must be triggered manually.

When I worked on one of the headlights in my car, I needed to remove the battery to gain better access. I used a discarded 12V UPS battery connected in parallel before disconnecting the starter battery. That way, the system never lost power. Putting it back is simply the reverse.... I only took out the UPS battery after the starter batter was back in-circuit. This is a good alternate use of a jump pack if you have one.