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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.

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Old Thu, Jun-14-2018, 04:22:25 PM   #24
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Default Re: RS-30 lithium battery

Originally Posted by Paulo M View Post
Yes, auto disconnect and auto start button feature on the battery itself! It does seem like a win win solution for those wanting to shed weight, regardless of their reason.

I personally donít want a lithium battery without these features.
The auto disconnect is nice because it prevents you from making an expensive mistake and ruining your battery. The Braille G20, G30(replacement for GU1R) and I'm sure many other batteries have this.

The auto restart usefulness depends on your application. The biggest benefit is it allows you to run an undersized(and cheaper) battery without having to worry about getting stranded, but at the cost of having your DME, clock, seat settings etc. reset when it happens. That's a pretty big penalty for a daily because setting your clock, seat settings and whatever frequently will get old fast, and you should just size your battery properly instead in which case you can get a cheaper option without the restart feature. On the other hand, it's a really nice feature for a racecar that has likely deleted the clock, factory electric seats, etc.

A properly sized battery really has no use for the auto restart. Unless you have some serious power draw from upgraded audio, a Braille G30/GU1R(39 Ah PbEq) is more than enough for a daily driven car unless you leave it sitting for more than 2 weeks at a time. If you do have some upgraded audio, the RS-30 with 50 Ah PbEq should be enough to replace the 60 Ah OEM battery which has some margin for error built in.

IMO, the auto restart on a RS-30 sized battery is pretty useless, but the same technology on their smaller batteries is very appealing for racecar use.
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Discussing RS-30 lithium battery in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)