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Jimny Battery

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30 Oct 2018 15:10 #197176 by Dogandthejimny
Jimny Battery was created by Dogandthejimny
Hi all new to the forum and finally a Jimny owner! Which will be my daily drive plus some offroading when the chance arises. I have question about the battery, Ill be changing it within next week or so before the cold weather comes in as its old. Can anyone reconmend a batterry to upgrade too? Ill also be potentially adding extra lights at somepoint.

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30 Oct 2018 20:36 #197186 by jim
Replied by jim on topic Jimny Battery
I kept with Yuasa and went for the YBX5057. 5 year warranty. Luckily Halfords had it in stock.

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30 Oct 2018 20:45 #197187 by mickt
Replied by mickt on topic Jimny Battery
You need one that the alternator can fully charge. Buying a huge capacity battery and a standard alternator does not work as the alternator can never fully charge it.

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31 Oct 2018 07:32 #197192 by muto
Replied by muto on topic Jimny Battery
I don't think bigger batteries need higher charging voltage. Jimny should be able to charge even 200Ah battery without issues, just slower.

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31 Oct 2018 10:52 - 31 Oct 2018 10:53 #197197 by yakuza
Replied by yakuza on topic Jimny Battery

muto wrote: I don't think bigger batteries need higher charging voltage. Jimny should be able to charge even 200Ah battery without issues, just slower.


I think so too. Also depends on how much you draw from it, temperature, quality of the battery and so on.

Our VW T5 is driven around locally most of the time seldom gets more than 3-5 minutes of use as most things are close by. In winter sometimes we use the Webasto to heat the car first, seat warmers, allways drive with lights on, heated mirrors and rear window all just for the five minutes of charging.
This of course leads to short battery life until couple of years ago i bought an AGM battery.
So pleased with it, no problems anymore.

Many cheap batteries nowadays does not cope with our cold weather either (Norway).

2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, 17%/87% high/low gears.
Last edit: 31 Oct 2018 10:53 by yakuza.

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31 Oct 2018 11:33 - 31 Oct 2018 11:33 #197199 by Max Headroom
Replied by Max Headroom on topic Jimny Battery
I'd be inclined to agree with Jim; Stick to an original particularly with a 5 year warranty in the offing!

In the past I've usually fitted an "extra-heavy-duty battery for a diesel" in every car I've had, diesel or not! I've never had a problem with batts not fully charging and I don't travel very far. But whatever you do, like Yakuza says - don't buy cheap!
In winter my car is mostly used only in the dark (go to work, return from work) and I allow the engine to warm a little without lights; fans; wipers; etc before moving off, while I check my phone messages/make calls, put on seat-belt. and don hat and gloves, I've never had a problem with a heavier duty battery not fully charging.

I notice now the cold weather has started that my engine takes quite a few more revolutions on the starter before it lights up. Last winter was the same, but throughout summer it was fine, so I might consider another battery myself soon.

Halfords is a good place to go if you have, or know someone with, a Trade card


IF IT AINT BROKE, KEEP FIXING IT UNTIL IT IS
Last edit: 31 Oct 2018 11:33 by Max Headroom.

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31 Oct 2018 12:14 #197204 by TomDK
Replied by TomDK on topic Jimny Battery

mickt wrote: You need one that the alternator can fully charge. Buying a huge capacity battery and a standard alternator does not work as the alternator can never fully charge it.


Who ever told you this is very wrong. Alternator size has got nothing to do with the ability to fully charge a battery. Charging voltage is what matters. Especially with never type AGM batteries.

+3" Trail Master. Fox 8.0" R/R shocks. ORA HD winchbumper. Warn M8274 Ox-motor + Hellfire gears, Delta-Tek mainshaft and freespool, overvolted. 33/9.5 R16 Silverstone Extreme. 5.14:1 ratio SJ transferbox in RW cradle. OMP rollcage.

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31 Oct 2018 17:25 #197209 by Dogandthejimny
Replied by Dogandthejimny on topic Jimny Battery
Cool thanks for the advice dudes. So Bought a YUASA YKX5057 as mentioned in the first post off Ebay with a 5 year warranrty. New battery will go straight in before the harsh cold set ins.

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31 Oct 2018 19:19 #197212 by mickt
Replied by mickt on topic Jimny Battery
So what you are saying is that you could put a never ending line of batteries connected to deliver 12v with a massive capacity and a ordinary alternator would be able to maintain the total charge of the package if the car only did short journeys whilst having a massive load selected day after day and week after week. I know this is a situation not likely but the point I am making is there is a limit to the output of a alternator that is why they have heavier duty ones as per the thread that was listed on this site not too long ago!

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31 Oct 2018 20:20 #197213 by TomDK
Replied by TomDK on topic Jimny Battery
Seriously?

It's a matter of doing the math. Of course you need to size the alternator to match the load.

But on a Jimny where the component that would draw the most amps would be a winch which is only used for short durations. Then it's no problem. I'm running 2x 75 Ah optima batteries off a standard alternator with not problem. Voltage is fine as it should. Even when doing week long winch heavy racing in Croatia.

So again.. There's no point in using a bigger alternator on a Jimny, unless of course you want the batteries charged faster. Or if you have a continuous load bigger than the output of the alternator. Which is very unlikely.

+3" Trail Master. Fox 8.0" R/R shocks. ORA HD winchbumper. Warn M8274 Ox-motor + Hellfire gears, Delta-Tek mainshaft and freespool, overvolted. 33/9.5 R16 Silverstone Extreme. 5.14:1 ratio SJ transferbox in RW cradle. OMP rollcage.

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31 Oct 2018 20:29 #197214 by mickt
Replied by mickt on topic Jimny Battery
And that is my point "unless you want the batteries charged faster". The point is if you do a lot of short runs with everything on and the battery is a larger capacity then normal for the car then although it will last longer giving the power eventually there will be a point where the alternator wont be able to supply the necessary charge to get the depleted battery to what would be its full intended charge as it would the capacity the alternator was meant to supply.

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31 Oct 2018 20:39 #197216 by TomDK
Replied by TomDK on topic Jimny Battery
I think you're just overcomplicating things now.

A decent quality battery is always better than a smaller one, no matter load and alternator. A bigger battery will keep voltage up far longer than a small battery.

So no , there's no point where the alternator will not be able to keep up or anything like that. Unless you have a continuous load bigger than the output of the alternator. It's that simple.

Again, I've never ever had any issues with starting my Jimny, even after very long winching sections. This is just how it is. Also why there's almost never any reason to install split-charge relays and what not.

+3" Trail Master. Fox 8.0" R/R shocks. ORA HD winchbumper. Warn M8274 Ox-motor + Hellfire gears, Delta-Tek mainshaft and freespool, overvolted. 33/9.5 R16 Silverstone Extreme. 5.14:1 ratio SJ transferbox in RW cradle. OMP rollcage.

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