Herm
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Re: 12 Volt Lead Acid Battery Replacement

Sun Jul 24, 2011 8:38 am

Four cells of a LiFePO4 chemistry are very safe, you can float them forever at 14.4V so that a car's charging system cant hurt them.. you can hold them at 16.8V for up to an hour without damage.

There are no acids or toxic materials inside a LiFePO4 battery.

DarkStar
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Re: 12 Volt Lead Acid Battery Replacement

Sun Jul 24, 2011 8:45 am

coolfilmaker wrote:I just learned of the horrifying fact that leafs come with lead acid batteries. Does anyone know of an appropriate replacement? I have read of lithium ion replacement batteries for ICE but I'm wondering if anyone knows of one that works well. The thought of reducing my range even one tenth of a mile with a lead weight is nauseating. Thanks

A123 is working on creating a drop-in replacement for a 12 volt lead-acid battery. I haven't heard what the status is, but I think it would be perfect for the LEAF:

http://www.greencarcongress.com/2011/03/a123-20110331.html
Mikiko (2011 Nissan LEAF ETEC) Status:
Reserved: 04/20/10 | Ordered: 10/01/10 | EV Project Blink Installed: 03/22/11 | Delivered: 03/25/11 | VIN: 568

Oregon Electric Vehicle Association | Electric Auto Association

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TonyWilliams
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Re: 12 Volt Lead Acid Battery Replacement

Sun Jul 24, 2011 9:45 am

smkettner wrote:Is your battery contructed with a wood box and sealed with tar? Or do you have six glass jars connected in series?



That's what it's missing !!! I should just build the wood box around the battery, and silicone look-alike tar.

BTW, does anyone know the group size of the tiny battery? Or what does the little thing actually weigh?



I did measure it and could not accurately determine the size. Maybe 22NF or 45.

Chart One

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Stanton
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Re: 12 Volt Lead Acid Battery Replacement

Sun Jul 24, 2011 11:04 am

DarkStar wrote:A123 is working on creating a drop-in replacement for a 12 volt lead-acid battery. I haven't heard what the status is, but I think it would be perfect for the LEAF:

http://www.greencarcongress.com/2011/03/a123-20110331.html


That looks like a great alternative; too bad they haven't got something out to the market yet.
2011 Blue Ocean SV w/floor mats & window tint
12v LiFePO4 battery & FIAMM 74100 horns
Wet Okole seat covers (front)
Tor's low-power heater mod
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Battery Pack replaced (Rev E) @51 months and 41k miles

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ttweed
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Re: 12 Volt Lead Acid Battery Replacement

Sun Jul 24, 2011 11:49 am

Stanton wrote:
DarkStar wrote:A123 is working on creating a drop-in replacement for a 12 volt lead-acid battery. I haven't heard what the status is, but I think it would be perfect for the LEAF:

http://www.greencarcongress.com/2011/03/a123-20110331.html


That looks like a great alternative; too bad they haven't got something out to the market yet.

You can always buy the Porsche Li-on car battery if you must have the highest zoot-factor right away.
Image
It's available now, weighs 13 lbs. and costs 1900 Euro in Germany.

TT
Tom Tweed
La Jolla, CA
Plowshare Media
2011 SLe #1317 del. 4/1/11
1st bar lost at 31,953 miles
2nd bar lost at 38,685 miles
3rd bar lost at 50,711 miles
4th bar lost at 59,758 miles after 64 months
Battery replaced at 61,307 miles.

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TonyWilliams
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Re: 12 Volt Lead Acid Battery Replacement

Sun Jul 24, 2011 7:31 pm

We don't need these "huge" batteries that are proposed / for sale, like the Porsche one, because we have no electric starter to power.

Something the size of a pack of cigarettes would do it.

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TomT
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Re: 12 Volt Lead Acid Battery Replacement

Sun Jul 24, 2011 8:21 pm

No, because we still have to power all the accessories and lights for an extended period when it is in ACC mode, plus we have to power all the vampire systems for up to 5 days when the car is off since the car only charges the battery once every 5 days. This requires more than a cigarette size pack of capacity...

TonyWilliams wrote:Something the size of a pack of cigarettes would do it.
Leaf SL 2011 to 2016, Volt Premier 2016 to 2019, and now:
2019 Model 3; LR, RWD, FSD, 19" Sport Wheels, silver/black; built 3/17/19, delivered 3/29/19.

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TonyWilliams
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Re: 12 Volt Lead Acid Battery Replacement

Sun Jul 24, 2011 9:00 pm

mogur wrote:No, because we still have to power all the accessories and lights for an extended period when it is in ACC mode



Under what circumstances is there an extended ACC mode ?

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TomT
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Re: 12 Volt Lead Acid Battery Replacement

Sun Jul 24, 2011 9:04 pm

Whenever you press the "on" button without your foot on the brake.

TonyWilliams wrote:
mogur wrote:No, because we still have to power all the accessories and lights for an extended period when it is in ACC mode



Under what circumstances is there an extended ACC mode ?
Leaf SL 2011 to 2016, Volt Premier 2016 to 2019, and now:
2019 Model 3; LR, RWD, FSD, 19" Sport Wheels, silver/black; built 3/17/19, delivered 3/29/19.

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TonyWilliams
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Re: 12 Volt Lead Acid Battery Replacement

Sun Jul 24, 2011 9:30 pm

And why would I do this for, presumably, a VERY long time with a load?

mogur wrote:Whenever you press the "on" button without your foot on the brake.

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