All who have light weight batteries, some help.

[nicksm3]

Originally Posted by tom @ eas

Or you can use the E46M3 CSL/Mini battery, which shaves off ~25lbs and no bracket needed, works perfectly.

Z4M battery has a bit more capacity and weight (9lbs more than CSL battery).

Oh I like this too!

[pbonsalb]

There is range of options that save weight. Expensive but very light lithium battery, 12 or 18 or 22 lb deka powersport battery, older miata battery, older mini battery (group 47?), H6 or Group 48.

I use a stock size battery in my street E90M3 and it lasts 5 years in New England parked outside. I used a 22 lb deka for about 28 months in my street E36M3 and it was done. Cranking power goes way down in cold. But if you are in warm weather and you trickle charge the battery you can get away with less. I drive too much to mess around with trickle chargers.

[CSBM5]

The "CSL battery" was actually used across many, many models but all in the EU; hence it's not something unique to the M3CSL. It's only 55AH, so keep that in mind. 16kg however, so it's lighter than stock one (due to its smaller capacity) which is about 21kg. Here is the cross-reference list and part number.

[roastbeef]

someone on here is also using a liteblox. looks like they have a few different models for different needs. i don't have any experience with them, just showing another option.

https://www.liteblox.de/shop/liteblo...port-batterie/

[nicksm3]

Originally Posted by roastbeef

someone on here is also using a liteblox. looks like they have a few different models for different needs. i don't have any experience with them, just showing another option.

https://www.liteblox.de/shop/liteblo...port-batterie/

?? another quality product

[bigjae1976]

I'm about to try a lithium battery from Advanced Auto for my E46 M3. It weighs 1lb and costs $130. Bad news is NASA now has a new rule for lithium batteries - not allowed in the cockpit or something.

[nicksm3]

Originally Posted by bigjae1976

I'm about to try a lithium battery from Advanced Auto for my E46 M3. It weighs 1lb and costs $130. Bad news is NASA now has a new rule for lithium batteries - not allowed in the cockpit or something.

Exactly! I didn't get the light weight battery because of time restraints in my everyday work schedule...so I kept the oem battery. They would not let me run Time Trials...also I asked about the Lithium Ion...they said NOPE. Can't use that either.

[nicksm3]

Originally Posted by bigjae1976

I'm about to try a lithium battery from Advanced Auto for my E46 M3. It weighs 1lb and costs $130. Bad news is NASA now has a new rule for lithium batteries - not allowed in the cockpit or something.

Exactly! I didn't get the light weight battery because of time restraints in my everyday work schedule...so I kept the oem battery. They would not let me run Time Trials...also I asked about the Lithium Ion...they said NOPE. Can't use that either.

[roastbeef]

just hollow out an oem battery and put the lithium battery inside of it.

[Rassilon]

optima red d35 is another option with bimmerworld aluminum mount

[nicksm3]

Originally Posted by edwardgtxy

optima red d35 is another option with bimmerworld aluminum mount

What's the weight?

[tom @ eas]

Originally Posted by CSBM5

The "CSL battery" was actually used across many, many models but all in the EU; hence it's not something unique to the M3CSL. It's only 55AH, so keep that in mind. 16kg however, so it's lighter than stock one (due to its smaller capacity) which is about 21kg. Here is the cross-reference list and part number.

It's commonly recognized as a CSL/Mini battery, easy to identify or find on google/forums.

The CSL/Mini is probably the smallest battery I would recommend on a daily-driven street vehicle, the Braille/Deka or other lightweights just have problems down the road. Especially for those with heavy winters that need the CCAs.

You can always temporarily switch to the race battery on track days to shed the some weight.

[Richbot]

I wouldn't mess around with a smaller lead acid battery in these cars either. The LiFePo ones seem to be holding up just fine, though I agree the realities of that chemistry will make the fun stop at around 20F unless you're willing to use a battery warmer and/or be patient waiting for the initial draw to warm up the battery before you crank, and if you drive in a real winter you better be prepared to swap

[roastbeef]

Originally Posted by nicksm3

What's the weight?

It's like $150 for 35lbs.

[Rassilon]

Originally Posted by roastbeef

It's like $150 for 35lbs.

D35 redtop is 32lbs. The mount from bimmerworld is pretty nice and agm battery is safer.

[Richbot]

Originally Posted by edwardgtxy

D35 redtop is 32lbs. The mount from bimmerworld is pretty nice and agm battery is safer.

Safer than what? If you have the Galaxy Note 7 and Boeing 787 fires in your head re the fire danger, those were not LiFePo batteries, which trade lower energy density for batter stability and much lower chance for runaway reactions. It's the OEM battery chemistry in a pretty long list of cars (and many other FIRE REALLY BAD applications) now.

http://articles.sae.org/13297/
http://articles.sae.org/14590/
http://articles.sae.org/7262/

[Rassilon]

Originally Posted by Richbot

Safer than what? If you have the Galaxy Note 7 and Boeing 787 fires in your head re the fire danger, those were not LiFePo batteries, which trade lower energy density for batter stability and much lower chance for runaway reactions. It's the OEM battery chemistry in a pretty long list of cars (and many other FIRE REALLY BAD applications) now.

http://articles.sae.org/13297/
http://articles.sae.org/14590/
http://articles.sae.org/7262/

Flooded ones

[Richbot]

Sorry for the mansplanation then, lol

[slicer]

I have been running Voltphreaks batteries for 5+ years with zero issues. First in my e46 and now in my e92. It's a great company with solid support. I needed a larger version when going from the e46 to the e92 and VP took my VPH750 and upgraded it to the larger VPH900 for a few hundred dollars. That's great service.

Side note - the VoltPhreaks batteries have an automatic shutoff to protect from over discharge (it leaves enough juice to start the car when you turn it back on). That can be problematic with a car like the E92 that has an electronic trunk latch and no key. That being said, VP batteries have a remote on/off button option. I utilized that and wired it to the cabin so that I can start the car if the battery shuts off. Lastly, VP's standard cable can't be utilized due to the huge battery terminals present with e92. I was able to get a right angle cord (with VP's direction) to solve that problem.

The battery isn't cheap but it has solid performance and technology, functions like OEM, and saves 50 lbs without any ill effects. I challenge you to name another modification available for the e92 that can drop 50 lbs for less money. Excluding gutting the rear seats....

[pbonsalb]

Originally Posted by edwardgtxy

D35 redtop is 32lbs. The mount from bimmerworld is pretty nice and agm battery is safer.

I think all "H" batteries are AGM. Optima is just a more expensive aftermarket one with 6 pack styling. The major battery companies all make AGM as well -- the "H" batteries.

[nicksm3]

Originally Posted by slicer

I have been running Voltphreaks batteries for 5+ years with zero issues. First in my e46 and now in my e92. It's a great company with solid support. I needed a larger version when going from the e46 to the e92 and VP took my VPH750 and upgraded it to the larger VPH900 for a few hundred dollars. That's great service.

Side note - the VoltPhreaks batteries have an automatic shutoff to protect from over discharge (it leaves enough juice to start the car when you turn it back on). That can be problematic with a car like the E92 that has an electronic trunk latch and no key. That being said, VP batteries have a remote on/off button option. I utilized that and wired it to the cabin so that I can start the car if the battery shuts off. Lastly, VP's standard cable can't be utilized due to the huge battery terminals present with e92. I was able to get a right angle cord (with VP's direction) to solve that problem.

The battery isn't cheap but it has solid performance and technology, functions like OEM, and saves 50 lbs without any ill effects. I challenge you to name another modification available for the e92 that can drop 50 lbs for less money. Excluding gutting the rear seats....

I'm going to have to look into this I appreciate it I'm going to start with SCCA and the NASA and I'm not sure if this battery will be compliant with their rules and regulations going to have to double check

[bigjae1976]

NASA update:

Lithium ion batteries must be outside of the passenger area of the vehicle. Note- a ruptured lithium ion battery is subject to instant ignition at such high temperatures, the owner/ builder runs the risk of the entire vehicle being consumed by the fire.

Now I need to redo my setup in my E46.