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.
2012 F10 528i . Sport . Premium . Technology
2007 E92 335i . Space Grey . Premium . Sport
2006 E85 M Roadster . Alpine White . 6MT
2006 E60 550i . Sapphire Black . A5 . Sport . Premium
2003 E39 530i . Titanium Grey . 5MT . Sport . Premium
1989 E34 535i . Black . A4 . Premium . RIP
1981 E28 530 . Grey . A4 . German Specs .
1977 E21 320 . Light Blue . 4MT . German Specs .