Anyone know where i can buy one?

Its half the size of the OEM piece. I weighed it at 21.5 lb. It goes for $125.

Its model # PC925T

Anyone knows the weight of the stock battery?

Originally posted by MPILOT
Its half the size of the OEM piece. I weighed it at 21.5 lb. It goes for $125.

Its model # PC925T

Anyone knows the weight of the stock battery?

52 pounds.

Is that battery you got mpilot still as good as the stock one, just lighter?

so 30 lb lighter and 1/2 the size of stock. Its a drycell race-style battery. Looks very good, I'll install tomorrow and I'll let you guys know.

Originally posted by MPILOT
so 30 lb lighter and 1/2 the size of stock. Its a drycell race-style battery. Looks very good, I'll install tomorrow and I'll let you guys know.

Will it still hold the same charge as the stock battery though? So will you be able to listen to music and leave the car sitting for a month or so without starting it?

I was told it holds the same charge, I don't know if it will start if left for a month.

MPILOT, where did you get it? Can it be found at any car store (Discount auto parts, etc..)?

Originally posted by JaWeb
MPILOT, where did you get it? Can it be found at any car store (Discount auto parts, etc..)?

And how much did it cost?

I just weighed my stock battery.
It clocked in at 47.5 lbs and 48.5 lbs with the brass bars.

Originally posted by JaWeb
I just weighed my stock battery.
It clocked in at 47.5 lbs and 48.5 lbs with the brass bars.

Damn, I was 2.5 lbs off :(

any pics?? :D

Sticky, that may be production tollerances, they could be using different suppliers, just like with the headlights and other parts.

Here's some useful info, although it relates to a smaller model. I'm sure the one you got that weighs 20.5 lbs holds more charge etc.

Lightweight Battery Info (http://forums.roadfly.org/bmw/forums/e46m3/forum.php?postid=932567&page=2)

P.S. I can't stand RoadFly's format. Maybe some of you guys can get some of their members to come here instead.

This site uses better software, that site has more traffic. If this site had as much traffic as them, I'd be the happiest forum surfer in the world. :biglaughb

It goes for $175, I paid $125. You can order it directly from odyssey or check out some local stores for the PC925T model.

Will the 625 series work? I wonder how much cca are available within the first 5 seconds.
For the 925 series, 900 cca are available within the first 5 seconds and then they drop to about 300..

I think any battery with cca over 760 (within the 1st 5 seconds) will work.

Check out this battery:

:buttrock

Realllllly small
(pictured in an M)

Orig. M3 Battery:

http://www.imagestation.com/picture/sraid57/pa791ee99e8720d6f3d2a9983bf9f38f7/fc6b9349.jpg

M3 With Small battery:

http://www.imagestation.com/picture/sraid57/p4c248dbaad9f04afb07a96fd54793996/fc6b9077.jpg

Top of small battery:

http://www.imagestation.com/picture/sraid57/p3c62010b0c2d82fe9fdb9679c21afa88/fc6b93a8.jpg

Side of small battery:

http://www.imagestation.com/picture/sraid57/p0b0faf489c8bf4450982638db5d54370/fc6b9371.jpg

I just installed the odyssey dry cell. The weight difference on the same scale was 27 lb. Thats around 2.5 HP for $125 :)

Try batterymart.com. They sell Hawker batteries. I picked up a model 925 for about $100.

Originally posted by BAVARIAN323i
Check out this battery:

:buttrock

Realllllly small
(pictured in an M)

Orig. M3 Battery:

http://www.imagestation.com/picture/sraid57/pa791ee99e8720d6f3d2a9983bf9f38f7/fc6b9349.jpg

M3 With Small battery:

http://www.imagestation.com/picture/sraid57/p4c248dbaad9f04afb07a96fd54793996/fc6b9077.jpg

Top of small battery:

http://www.imagestation.com/picture/sraid57/p3c62010b0c2d82fe9fdb9679c21afa88/fc6b93a8.jpg

Side of small battery:

http://www.imagestation.com/picture/sraid57/p0b0faf489c8bf4450982638db5d54370/fc6b9371.jpg


This one is a lot lighter than 27 lbs....try around 12

Just ordered a Hawker Genesis G16EP 13.5lb battery! I use the car on a daily basis now, so I'm confident it will hold it's charge nicely. Guess I'll have to wait and see. Definitely a cost effective mod though!

......and to think I spent $2500 on an exhaust to save a similar amount of weight! haha!:clap: The battery only set me back $90. :D

The Hawker Genesis G16 EP is the same as the Odyssey PC 680.
The PC680 provides 680 CCA, which is on the borderline of the required abount of Cold Cranking Amps. Make sure that battery is sufficient and wont leave you stranded!

JaWeb,
Thanks for the heads up, but I spoke to a "tech" who is involved with racing and he told me that the FLA batteries and SLA batteries CCA's are not the entirely the same. The CCA rating on a sealed lead acid (SLA) battery is equivalent to a higher rating for a flooded lead acid battery (FLA).

I'm confident it'll work ok, but we'll see. Btw, there is a guy on the Roadfly board that uses this same battery and has had no problems so far. Only negative aspect is that its relatively small "capacity" causes it to discharge faster, but if the car is used daily then there should be no problems. Main benefit of this battery is the 38+ lbs of weight savings!! :12:

In addition, the CCA rating is the number of amps a battery can deliver for 30 seconds at 0ºF (-17.8ºC) and not drop below 7.2 volts. I don't plan on spending much if any time driving in 0 degree weather so....

I might even drop the original battery back in during the extreme winter months if necessary!!:)

One more thing....
The nominal short-circuit current for a fully charged Hawker Genesis G16EP battery is 1600 amps. What that means is a peak of 1600 amps is possible. Not likely, but possible in a short-circuit like condition.

I thought CCA was the amount of Amps delivered during the first 5 seconds?

My stock battery weighed 47.5 lbs. The PC 925 weighs in at most 26lbs - weight savings od 21.5 lbs..

If the PC 680 works, I would love to shed another 20 lbs...

Actually, the reason why you usually see the 5 seconds, 10 seconds, and 15 seconds CCA ratings is because next to each one they state a specific voltage drop. For example, a battery might have a CCA of 600 for the first 5 seconds at 12volts, then a CCA of 500 for the next 10 seconds at 9.5volts, and then a CCA of 450 for the next 15 seconds at 7.2volts. What they did was to list the peak amperage acheivable for a certain amount time and at a specific voltage. Another way of rating that specific battery would be to give the overall average of 516 CCA for an interval of 30 seconds, before the battery drops below the predetermined 7.2 volts. In other words, it's just another way of writing the same info.