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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   #31
Volke
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Default Re: RS-30 lithium battery

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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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Old Thu, Jun-14-2018, 04:31:21 PM   #32
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Default Re: RS-30 lithium battery

Quote:
Originally Posted by Volke View Post
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.
Nothing on the DME gets lost when it loses power, and neither do seat settings.

If you don't have something that sets the clock automatically (e.g. intravee), that could be a slight PITA.

That said, I, too, would prefer to (and do) have a sufficiently large battery that i don't have to worry about it.

I can see the allure of the final start feature, though. Leave something plugged in overnight, no problem.
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Old Thu, Jun-14-2018, 05:00:02 PM   #33
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Default Re: RS-30 lithium battery

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Originally Posted by Obioban View Post
Nothing on the DME gets lost when it loses power, and neither do seat settings.

If you don't have something that sets the clock automatically (e.g. intravee), that could be a slight PITA.

That said, I, too, would prefer to (and do) have a sufficiently large battery that i don't have to worry about it.

I can see the allure of the final start feature, though. Leave something plugged in overnight, no problem.
Hmm... I'll have to take your word on the DME. I have not had the E46 long, and I'm used to turbo cars that have some learned parameters( ex. A/F Learning & Fine Knock Learning on the Subaru STI).

The programable shift lights & beep, reverse tone, and gear indicator on my BRZ also reset along with the clock, so I figured there's be more stuff that resets on the E46 besides the clock.

I just bought a Braille G30 that I'm installing soon, but I look forward to seeing what else is new on batteries in a few years.
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Old Sat, Jun-16-2018, 07:21:04 PM   #34
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Default Re: RS-30 lithium battery

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Originally Posted by Move_Over View Post


Just fabbed something up out of threaded rod and aluminum.


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Thank you for the response. I'll have to fab something up as I ordered this battery and it just came in. The thing is tiny!
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Old Sun, Jun-17-2018, 07:32:09 PM   #35
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Default Re: RS-30 lithium battery

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Originally Posted by Volke View Post
Hmm... I'll have to take your word on the DME. I have not had the E46 long, and I'm used to turbo cars that have some learned parameters( ex. A/F Learning & Fine Knock Learning on the Subaru STI).

The programable shift lights & beep, reverse tone, and gear indicator on my BRZ also reset along with the clock, so I figured there's be more stuff that resets on the E46 besides the clock.

I just bought a Braille G30 that I'm installing soon, but I look forward to seeing what else is new on batteries in a few years.
The learned parameters on the DME are stored in non-volatile memory - battery disconnect won't impact it.

You'll lose the clock, mpg/average speed calculations, and radio presets I think when disconnecting the battery
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Old Sun, Jun-17-2018, 07:47:24 PM   #36
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Default Re: RS-30 lithium battery

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Originally Posted by terraphantm View Post
The learned parameters on the DME are stored in non-volatile memory - battery disconnect won't impact it.

You'll lose the clock, mpg/average speed calculations, and radio presets I think when disconnecting the battery
not the radio presets either as I found out recently after my battery was dead. clock, mpg yes
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Old Sun, Jun-17-2018, 11:03:47 PM   #37
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Default Re: RS-30 lithium battery

My GU1R mounting location. I put it under the hood because it's not doing anything meaningful for weight distro at 5.7 lbs, and the battery cable to the trunk is 8 lbs-- heavier than my battery!

Tank in front of it is my light weight, one pint washer tank. I use that because I rarely need washer fluid with how I use the car, but still don't want to be without it if I need it.

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Old Mon, Jun-18-2018, 04:07:05 AM   #38
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Default Re: RS-30 lithium battery

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Originally Posted by Obioban View Post
My GU1R mounting location. I put it under the hood because it's not doing anything meaningful for weight distro at 5.7 lbs, and the battery cable to the trunk is 8 lbs-- heavier than my battery!

Tank in front of it is my light weight, one pint washer tank. I use that because I rarely need washer fluid with how I use the car, but still don't want to be without it if I need it.

What washer tank is that? Are the battery and washer brackets custom? Did you get rid of the factory battery disconnect or relocate it to the front?

I want to run the hard motorsport race brake ducts so I need to move my washer bottle too. I've thought about moving my battery up front too, but I also want to run an oil catch can. Don't think I can fit all 3 in that compartment.
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Old Mon, Jun-18-2018, 11:06:24 AM   #39
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Default Re: RS-30 lithium battery

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Originally Posted by Volke View Post
What washer tank is that? Are the battery and washer brackets custom? Did you get rid of the factory battery disconnect or relocate it to the front?

I want to run the hard motorsport race brake ducts so I need to move my washer bottle too. I've thought about moving my battery up front too, but I also want to run an oil catch can. Don't think I can fit all 3 in that compartment.
That's the e39 high intensity washer tank. I had it sitting around from when I removed it from the M5, but it's actually a perfect fit in the area-- it actually wraps around the battery

It also is designed to work with the same pump as the e46, so it's plug and play with our wiring harness.

I kept (and relocated) the factory battery disconnect feature, as well as the huge chassis fuse.

Tank looks like this:



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Last edited by Obioban; Mon, Jun-18-2018 at 06:46:10 PM.
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Old Mon, Jun-18-2018, 06:38:03 PM   #40
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Default Re: RS-30 lithium battery

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is that battery mount custom or available to purchase?
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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 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)