Thought you guys might get a kick out of this (Lightweight battery options) - Honda Accord Forum : V6 Performance Accord Forums
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Old August 17th, 2014, 11:00 AM   #1
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Thought you guys might get a kick out of this (Lightweight battery options)

In theory our cars need 700-800CCA to crank the engine over the course of about 2-3 seconds. Everything after that the alternator takes care of.
In reality(when warm) the car can be started with a 180 CCA battery.

Doing a few conversions this means we are reccomended to have about 3000Farad (IIRC) available to start the engine. In reality it is under 1000F required.
As of last year it is fairly easy to get supercapacitors EASILY capable of 3000F. A small Li-po battery is required to reliably maintain voltage for longer than a week though.

Conventional weight:
Optima Batteries RedTop Starting Battery, Group Size 34R, 800 CCA
Weight: 41 lbs

Price: $217.99

Battery + Capacitor weight
3000 F 2.7V Maxwell BCAP3000P super farad capacitor
Weight .89 lb (405 grams)
6X 3000F 2 7V Maxwell Ultracapacitor Super Farad Capacitor Booster Cap BCAP3000 | eBay

2200mAh 4S 14.8V 30C LiPo Battery Pack
8.20 oz (232g)

Price: ~$360(or less, if you can find a cheap source/battery pack)


Total weight 1-2 lbs depending on battery pack.

Proof of concept.
https://www.youtube.com/watch?v=GUXM1XuLUIs

Someone had a video with the "Hybrid" capacitor(battery+capacitor) running for about 6 months. Can't find it at the time.


Opinions? We've done more costly things to remove 30-40 lbs from the car before (removing a/c, $800+ Magnesium manifolds, expensive lightweight rims)

Personally, if I can put this in the car with a 5 lb front battery and this in the rear to stabilize the sound system, I will be very happy losing the other 35 lbs so I can justify putting a 35 lb box in the trunk.

Source: http://www.caraudio.com/forums/general-discussion/607329-58-farad-super-capacitor-$80.html
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Old August 17th, 2014, 11:01 AM   #2
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For people who want to keep a conventional battery but stabilize a large system- 58F pack.
Ultracapacitor Module Kit Battery Eliminator Car Audio Starting Remote Solar | eBay

Don't buy a small 1F $200 capacitor from your local audio store. These little guys can discharge 100x as fast and actually give you a few extra watts back there. May also be useful just before the fuse box for those running boost/nitrous engines or just want 98% stable injector/spark voltage.
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Old August 17th, 2014, 11:18 AM   #3
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Were you talking about this guy?

https://www.youtube.com/watch?v=GPJa...p9MDChEC9ccavr
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Old August 17th, 2014, 12:10 PM   #4
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hobbyking is cheap for lipo.

i run this battery

NRGCELL Slim combo with terminal posts and battery conditioner - HeelToe Automotive
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Old August 17th, 2014, 12:58 PM   #5
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Originally Posted by bozos_si View Post
yeah. i remember seeing that years ago. Thought about doing this.
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Old August 17th, 2014, 12:59 PM   #6
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No image. Can you show a picture of yours?

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Old August 17th, 2014, 01:27 PM   #7
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Same guy as in the post. That was before those little ones were available to order in an amount less than 1000. Those big ones are still about 10 lbs, but have MASSIVE capability.

He had a video of a little airsoft battery and his mini supercaps in the car after about 6 months that hadn't died once. No solar panel required.
It was only a 2w solar panel so obviously there's not much drain.



This is the battery he has. Still about 15 lbs. has 480 CCA. Guessing this battery has never caused you issues for starting up even at 480 cca?

If one of these port an polish jobs goes through I can pick up the little 48F pack. If I can land two of them and sell my big battery i'll give this combo a shot.
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Old August 17th, 2014, 04:39 PM   #8
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waiting for winter to come. its fine so far
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Old August 17th, 2014, 06:18 PM   #9
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My car is parked during winter so one of these batteries would be fine. I would like to go lighter though.
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Old August 17th, 2014, 06:19 PM   #10
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My car is a beater. U could get a smaller one and take the battery inside and tender it once a month
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