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      01-20-2013, 03:10 PM   #1
Raucky2000
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Braille 21lb Racing Batt Installed

Alright so let me start by sharing...Yes, I've read the other threads and the down falls of cutting the battery's capacity by so much.

I installed this battery with a HP mounting bracket so everything went together really well. The hardest part was removing the factory fatty out of the rear fender area.

I charged the battery all the way on my trickle charger and then installed it at about 3pm yesterday. I drove around with my wife till around 1:30am after making 6 stops (dinner, bar, movie, casino, gas station, bar). Don't worry I wasn't drinking and driving, I played pool and darts while the wife talked with her girl friends and I only lost $55 bucks.

The amount of time at each place ranged from 10-150mins, so there wasn't much down time. The biggest distance traveled was about 20 miles, one way, so not much charge time either. I ran the heater, radio, windows, heated seats, and charged my wife I-phone during all of our travels.

Now when we reached the house, I plugged in the trickle charger to see the red 25% life led flashing at me. I was really surprised that one evening out pretty well cashed out the batteries charge life!

Consider this fair warning that you could be strained with this battery in ONE day!

Now to share that the M isn't my daily driver, but my toy like a lot of you guys out there. I figured on plugging it in each time, so I just chalk it up to practicing for my electric car someday in the FAR FAR Far future. I hope!
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      01-20-2013, 06:06 PM   #2
djantlive
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I would only buy lithium ion battery if weight saving is a priority. They will set up back $$$
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      01-20-2013, 06:22 PM   #3
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The Braille 21 lb battery is a Deka ETX30L powersports battery that costs about half what Braille charges. I ran one in my E36M3 for about 12 months, including winter, before it would no longer start the car. But the E90M3 is a bigger motor with higher compression and more electrical junk to wear down the battery. I would not bother with the Deka 21 b battery unless you don't mind regularly trickle charging it, live in a warm area, and don't mind short life. I now run the Mini battery in my E36M3 (which BMW supposedly runs in its E46M3 CSL and E90M3 GTS) and it is doing fine in its second winter. I would not go any smaller than that on my E90M3 since I drive it year round including winter and it sits outside for days at a time sometimes.

The Voltphreaks lithium ion stuff is nice, but LI does not do well in the zero degree weather I see sometimes. It is also too expensive for me. Great for a race car with a large budget, though.
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      01-20-2013, 07:27 PM   #4
Raucky2000
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Yeah I've heard good things about LI batts being really light and $$$$...I noticed today that just having the factory alarm armed drained my batt to 25% in around 7-8hrs (it's about 30 degrees here today). She plugged back in and will be ready to roll next time.

Is there a way to leave the alarm off, but still lock the doors with the remote?
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