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Stanton
Posts: 2033
Joined: Thu Feb 03, 2011 10:56 am
Delivery Date: 01 Sep 2011
Leaf Number: 7458
Location: Plano, TX
Contact: Website Twitter

Re: 12 Volt Lead Acid Battery Replacement

Tue Nov 01, 2016 7:48 am

bmartin wrote:Quick calculations: you could store 4 in a row (parallel), and 4 in a line (series) in that enclosure, with room for the BMS. Using 16 20Ah cells you could store about 1kwh (16 cells * 20Ah * 3.2v = 1024kwh), or 320Ah. That is almost a 10x increase over the Lead Acid hazard. I run many accessories off of my 12v system so I see many benefits. Though the cost would be almost $500 for all needed parts and cells.


You could buy a good 12v Lithium "drop in" replacement battery (with a built-in BMS) for that kind of money. Not to mention that capacity is way overkill: I have a 20 Ahr 12v LiFePO4 battery in my car and have never had a "dead" 12v battery (and I run a lot of ACC).
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
2013 sun visor
3G modem upgrade
L2 EVSE Upgrade
Battery Pack replaced (Rev E) @51 months and 41k miles

chivalryx
Posts: 41
Joined: Mon Jul 04, 2016 3:38 pm
Delivery Date: 04 Jul 2016
Location: Coquitlam, BC

Re: 12 Volt Lead Acid Battery Replacement

Sat Dec 31, 2016 3:35 pm

Wanted to thank all the posters for all the tips and info. I took the plunge and swapped out my lead acid for a 20ah prismatic LiFeMnPO4 battery. Should meet my needs. I found the easiest swap was using:

4 gauge battery cables like these:
http://www.canadiantire.ca/en/pdp/motom ... p.html#srp

Battery with case like one of these (option for BMS if you don't want to check it periodically):
http://www.batteryspace.com/lifepo4-pri ... d-dgr.aspx

Water resistant tape to cover any gaps or holes in the case since I'm a little paranoid.

Just screw one end of the cable onto the LiFePO4 battery terminals (a round metal washer helps hold it tight), and screw the other end of the cable between the car's battery post clamps (threaded the screw through the cable terminal end), and done! Took like 10 minutes.

My only difficulty now is how to keep the battery in place since it's so small. For now some foam inserts work, but it's not optimal. Any tips from early adopters would be appreciated!

Chiv.
2013 White Pearl SV (No quick charge)
Weathertech custom floormats
Aftermarket LED Headlight upgrade (45W 4800 lumen/bulb)
12V 20Ah Prismatic LiFeMnPO4 Lead Acid replacement
Aftermarket Rear Backup Camera wired to NAV

User avatar
Stanton
Posts: 2033
Joined: Thu Feb 03, 2011 10:56 am
Delivery Date: 01 Sep 2011
Leaf Number: 7458
Location: Plano, TX
Contact: Website Twitter

Re: 12 Volt Lead Acid Battery Replacement

Sat Dec 31, 2016 4:18 pm

chivalryx wrote:
My only difficulty now is how to keep the battery in place since it's so small. For now some foam inserts work, but it's not optimal. Any tips from early adopters would be appreciated!


I simply put a block of wood under my case (which I turned on it's side) so I could use the original clamp/tray. I was able to screw it down tight enough to where I've had no issues for > 2 years now.
Congrats on "getting the lead out"!
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
2013 sun visor
3G modem upgrade
L2 EVSE Upgrade
Battery Pack replaced (Rev E) @51 months and 41k miles

chivalryx
Posts: 41
Joined: Mon Jul 04, 2016 3:38 pm
Delivery Date: 04 Jul 2016
Location: Coquitlam, BC

Re: 12 Volt Lead Acid Battery Replacement

Sun Jan 01, 2017 11:48 am

Stanton wrote:
chivalryx wrote:
My only difficulty now is how to keep the battery in place since it's so small. For now some foam inserts work, but it's not optimal. Any tips from early adopters would be appreciated!


I simply put a block of wood under my case (which I turned on it's side) so I could use the original clamp/tray. I was able to screw it down tight enough to where I've had no issues for > 2 years now.
Congrats on "getting the lead out"!


Thanks Stanton. Will give it a try!
2013 White Pearl SV (No quick charge)
Weathertech custom floormats
Aftermarket LED Headlight upgrade (45W 4800 lumen/bulb)
12V 20Ah Prismatic LiFeMnPO4 Lead Acid replacement
Aftermarket Rear Backup Camera wired to NAV

Kristis
Posts: 56
Joined: Sun Jan 15, 2017 11:39 am
Delivery Date: 15 Jan 2017
Leaf Number: 014631
Location: Lithuania, Europe

Re: 12 Volt Lead Acid Battery Replacement

Thu Jan 19, 2017 1:04 pm

Does anyone know the dimensions of original battery?
'13 Nissan Leaf
TBD Tesla Model 3 (late European reservation)

User avatar
Stanton
Posts: 2033
Joined: Thu Feb 03, 2011 10:56 am
Delivery Date: 01 Sep 2011
Leaf Number: 7458
Location: Plano, TX
Contact: Website Twitter

Re: 12 Volt Lead Acid Battery Replacement

Thu Jan 19, 2017 5:32 pm

Kristis wrote:Does anyone know the dimensions of original battery?


From the datasheet for the "stock" 12v battery:

9 3/8 x 5 1/16 x 8 15/16 (inches)
19.8 lbs and 45 Ahr

Note: I replaced mine with a 20 Ahr LiFePO4 at about half the weight (and smaller to the point where I turned it on it's side).
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
2013 sun visor
3G modem upgrade
L2 EVSE Upgrade
Battery Pack replaced (Rev E) @51 months and 41k miles

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IssacZachary
Forum Supporter
Posts: 741
Joined: Fri Jan 13, 2017 9:57 am
Delivery Date: 15 Nov 2016
Leaf Number: 420789
Location: Gunnison, CO, USA

Re: 12 Volt Lead Acid Battery Replacement

Fri Jan 20, 2017 9:57 pm

Any suggestions for a good battery replacement for Colorado high mountains where -40*F/-40*C temperatures can occur?

I was thinking the Winston 90ah battery. It's rated to -45*C charge and discharge.

Or a capacitor pack made from 6 3,000F ultra capacitors made by Maxwell's Boostcap. Those are rated to -40*F/-40*C.
2013 SL 50,000 miles.
12 bars until 44,300 miles on June 2, 2017. :D
11 bars current. :)
The Nissan Leaf is the fourth best long distance car for highway driving. >>Best Long Distance Cars<<

LeftieBiker
Posts: 8385
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: 12 Volt Lead Acid Battery Replacement

Fri Jan 20, 2017 11:25 pm

Keep in mind that the power demands on the 12 volt battery are modest. It just has to be tolerant of deeper cycles (but with lower current demands) than typical starting batteries are, and of being chronically undercharged. I suggest you get a mid-priced marine-type compromise battery, and a Battery Tender or Battery Tender JR, if you have a place to plug one in. My OEM battery is still original, and after 4+ years, with one near-dead episode after the first year, it's still working because of the $30 Battery Tender JR. I use.
2013 "Brilliant Silver" SV with Premium and no QC, a 2009 Vectrix VX-1 W/18 Leaf modules, and 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

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IssacZachary
Forum Supporter
Posts: 741
Joined: Fri Jan 13, 2017 9:57 am
Delivery Date: 15 Nov 2016
Leaf Number: 420789
Location: Gunnison, CO, USA

Re: 12 Volt Lead Acid Battery Replacement

Sat Jan 21, 2017 12:06 am

Ah! Thanks! I wonder if I ought to have it checked from time to time and can it good. Yes, a battery tender sounds like a great idea. Also a Kats battery warmer. Maybe a flexible solar panel and charging circuit. I do have the little solar panel on the top of the rear hatch. :mrgreen:
2013 SL 50,000 miles.
12 bars until 44,300 miles on June 2, 2017. :D
11 bars current. :)
The Nissan Leaf is the fourth best long distance car for highway driving. >>Best Long Distance Cars<<

LeftieBiker
Posts: 8385
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: 12 Volt Lead Acid Battery Replacement

Sat Jan 21, 2017 2:22 am

That little solar panel may actually help...if you can park the car so the panel is in direct sun for 5+ hours a day. I suggest you check the resting voltage, by leaving the hood unlatched a couple of hours (to avoid having to open a car door), then putting a voltmeter on the 12 volt battery terminals. 12.6 volts or more and you're fine. 12.5 volts and the situation is marginal. below 12.5 volts and the battery tender is a good idea. I used the hardwire connection that came with the tender, but made it longer with a two wire 120 volt appliance cord, IIRC. I then connected it to the positive battery terminal, a bolt on the inverter stack for ground (the assembly that looks like a valve cover, specifically), and ran it into the charging port compartment, through a small hole I drilled. Now I plug in whenever I think the car will be plugged in longer than it will be charging, which in my case is most times.
2013 "Brilliant Silver" SV with Premium and no QC, a 2009 Vectrix VX-1 W/18 Leaf modules, and 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

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