BigJimny Meet 2019 (17 May 2019)

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Jimny battery upgrade

02 Jul 2019 17:26 #210517 by Garuuu
Jimny battery upgrade was created by Garuuu
Hey guys, I've got a warn tabor 9k winch and a (ithink)28 inch light bar on my Jimny with the stock alternator and want to upgrade my battery not sure if I need it but just wanna do it for peace if mind. Any recommendations on battery size for the stock tray?

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03 Jul 2019 04:33 #210529 by Lambert
Replied by Lambert on topic Jimny battery upgrade
Looks good though I would be a little worried about air flow to the radiator? It does depend on the depth of your pockets but odyssey have a good reputation as do Optima. Have you considered a twin battery setup? More expensive but also more reliability as extended winch work won't affect the starting battery?

Dreadnaught (black 2011)

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03 Jul 2019 06:10 #210534 by Garuuu
Replied by Garuuu on topic Jimny battery upgrade
Yes I've looked at the second battery tray from jimny bits but it says it might not fit some air conditioning models due to the metal lines being in the way, I had a look at the spot where it goes and it doesnt look it it would fit.

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03 Jul 2019 06:12 #210535 by Garuuu
Replied by Garuuu on topic Jimny battery upgrade
And about the air flow, the temp needle stays just below the middle as it was before I had the winch.

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05 Jul 2019 07:01 - 05 Jul 2019 07:29 #210655 by kirkynut
Replied by kirkynut on topic Jimny battery upgrade
The ideal solution would be a Jimny Bits battery tray but it sounds like that's out of the question due to the aircon pipes, which is a pain.

Personally I would not want to use a battery so small it fits in the standard battery tray for starting and winching duties as you might well flatten it with the winch and it won't last too long with that sort of usage.

So you're left with the problem of where to put a bigger battery whether you use one big battery or a twin charging system for the standard battery and a bigger one.

I once mounted a big Numax Leisure battery in the boot. They're great batteries for starting and winching duties but I decided it was not a good idea to have a lead acid battery in the passenger compartment due to the gasses produced when charging from the alternator and the possibility of explosion and battery acid spraying on us. Unlikely but possible.

My big Numax is now under the bonnet in a Jimny Bits Battery tray!

I think that you could fit a big leisure battery in the boot and use a gel battery (AGM), like Odyssey, Optima or Excide. You want as many Cold Cranking Amps as you can get, so 800 cca if you can.

The cca's are needed for the massive draw of the winch under load.

Have a look here: www.tayna.co.uk/leisure-batteries/

Use no less than 50mm squared cable to go from the battery to the front of the car (live and earth) and winch and perhaps use a buzz bar that's isolated electrically from the car body for the live to connect the car to this supply and the winch.

My lives are all bolted to the original battery live connector and wrapped in insulating tape but I really need to sort out a proper solution.

50 mm cable needs big crimp connectors and a big crimp tool to go with them.

None of this is cheap but to my mind it's the best solution.

There is another benefit to using one big battery for starting and winching duties. This is that the standard battery is only just adequate when the car is new. Suzuki have never used wiring that is any more than the minimum and it breaks down with age, gaining resistance. So the puny cca it provides is reduced by old wiring and the starter struggles. This causes carbon build up in the starter motor and shortens its life.

When I added a big battery it was like I'd fitted a new starter motor too! It flew over! I thought I could drive the car on the starter motor!


The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.

My Jimny Thread Here: www.bigjimny.com/index.php/forum/8-my-ji...on-continues?start=0
Last edit: 05 Jul 2019 07:29 by kirkynut.

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