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12V battery BCI Size?

Posted: Tue May 22, 2018 3:57 pm
by jray3
I thought that I'd seen this posted, but searches revealed nothing. Anybody know the BCI group number offhand?

Re: 12V battery BCI Size?

Posted: Tue May 22, 2018 4:54 pm
by Don
A Google search says it's a 151R - viewtopic.php?t=2789

I bought a Miata AGM battery because I was familiar ith them, they're AGM and it was cheaper than the flooded replacement. Installed it in one of the cars about 2 years ago. It's not as tall as the OE battery, but I cut a piece of 2 X 6 the size of the battery to sit it on and it installed with the factory hold down clamps - Quick and easy install

Don

Re: 12V battery BCI Size?

Posted: Tue May 22, 2018 5:26 pm
by jray3
THX Don- My dad dutifully disconnected mom's original i-MiEV battery before putting the car into hibernation for 4 months, but without a 12V float it self-discharged down to 4 volts!

Re: 12V battery BCI Size?

Posted: Wed May 23, 2018 7:01 am
by Don
Same thing happened to us - The car was stored for about 6 months without a trickle charger and the OE battery was toast. The other car, driven regularly still has the 6 year old OE battery going strong. If you plan to store an older car for a month or more, a maintenance charger is a must

Don

Re: 12V battery BCI Size?

Posted: Fri May 25, 2018 8:15 am
by wmcbrine
Don wrote:A Google search says it's a 151R - viewtopic.php?t=2789

I can add that a regular 151R is a perfect fit -- no boards needed. :)

Re: 12V battery BCI Size?

Posted: Fri May 25, 2018 10:19 am
by Don
. . . . but a flooded lead acid battery in a lithium powered car just seems so . . . . Twentieth Century :lol:

Don

Re: 12V battery BCI Size?

Posted: Fri May 25, 2018 10:50 am
by ed5000
Don wrote:. . . . but a flooded lead acid battery in a lithium powered car just seems so . . . . Twentieth Century :lol:

Don

That would be great if they could find a dc to dc converter robust enough to power all the controls and accessories without a lead acid battery. Obviously it would have to be powered up from the traction battery 24/7.

Re: 12V battery BCI Size?

Posted: Fri May 25, 2018 12:16 pm
by JoeS
Check out this Headway LiFePO4 i-MiEV 12v battery from September 2012 -

http://myimiev.com/forum/viewtopic.php?f=9&t=694&p=4035&hilit=Headway#p4035

Re: 12V battery BCI Size?

Posted: Fri May 25, 2018 1:03 pm
by Don
ed5000 wrote:That would be great if they could find a dc to dc converter robust enough to power all the controls and accessories without a lead acid battery. Obviously it would have to be powered up from the traction battery 24/7.
In actuality, that's exactly what's happening - Nothing 'runs off the 12 volt battery' while you're driving the car. It's just there to get it started. The DC to DC converter is quite robust (capable of 70 amps output, IIRC) and it can and does power every 12 volt accessory with plenty left over to recharge the 12 volt battery if it's ever in need of a charge

Don

Re: 12V battery BCI Size?

Posted: Sat Feb 16, 2019 1:15 pm
by PV1
151R is the size you need. After 6 years of ownership (7 year old battery/car), my 12 volt battery finally gave out. Just replaced it this morning with this:

https://shop.advanceautoparts.com/p/aut ... 7CL3*15597

Car came right back to life, although I lost my trip odometers and radio presets as I expected. The original battery was at 2 volts, having sat through some wild temperature swings for about a month. Trying to charge it, my charger would do a check and error out with "shorted cell", and all the higher the resting voltage would go was 11.2 volts.

Definitely going to be investing in solar maintainers.