Absolutely wrong. Your charging strategy will be set to overcharge the new battery, and possibly damage your alternator. It's not snake-oil- Just pay the $100.
Originally Posted by Laci535i
I am with you, man! 2 bolts for the bracket and one each post. Easy money for the stealer plus another $100 for registration to get 2-3 month extra battery life? It is a joke! Autozone 3 year replacement warranty and prorated to 8 years. And the battery is $160.
550i . Sport . Nav . L7 . Sirius . Cold . Eibachs . Bilsteins . 19" TSW . K&N . MTech V3