Safe to do pulse repair without disconnecting battery?

[f355spider]

Good to know, and sorry that happened. I've been disconnecting the battery and it sounds like that was a good idea. Although, I'm also unimpressed with Mazda's quality control. At 53K, my 2014 Mazda 3 exhaust manifold cracked, necessitating an out-of-warranty, $2200 repair last year.

I decided to get around the infrequently-driven battery problem by installing a remote cutoff switch and, soon, an AGM battery because they can withstand deeper discharges without significant sulphation, so for me the question is now moot.

My technician that works on my cars told me that modern cars should not routinely use battery cut off switches. The ECUs for not only the engine but also the transmission store all the user history, idle parameters and such. All that is lost each time you use the cut off switch and the car defaults to the base line and has to relearn all of that. He recommended to use a battery tender, as that is exactly the situation they were designed for.