Mitsubishi Outlander PHEV Forum

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 Post subject: Re: Flattened auxiliary battery - any consequences?
PostPosted: Mon Apr 09, 2018 9:00 am 
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Joined: Mon Mar 12, 2018 2:18 am
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Location: Yorkshire end of M1, UK
Anything metal bolted to the engine or bodywork would do as an earth

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 Post subject: Re: Flattened auxiliary battery - any consequences?
PostPosted: Mon Apr 09, 2018 11:14 am 
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Location: Swindon,UK
ThudnBlundr wrote:
Anything metal bolted to the engine or bodywork would do as an earth

That could be tricky.. the Bodywork seems mostly plastic to me..

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 Post subject: Re: Flattened auxiliary battery - any consequences?
PostPosted: Tue Apr 10, 2018 12:24 am 
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Joined: Mon Sep 26, 2016 11:18 pm
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Location: Poland
greendwarf wrote:

Perhaps that's all the dealer does in these semi-mythical BMU resets that result in apparent increased SoH - disconnect the aux battery overnight. :lol:


It would be nice ... but I think it is not enough

I do disconnect the 12v battery for 5/10min every 3 months for avoid ICE to kick in for burn "old" fuel

Unfortunately my SOH never jump back to 100%

But, on the very next trip .. my EV guessed range jump to the magic 52km .. but it does drop very fist while driving

I guess it lose the last average consumption on the previous trip and it set the average consumption to match the 52km range with the known SOH

Only thing I lose on removing the battery .. is the previously cabin temperature (it does goes back to 22deg) .. and the trip history, and charging history in the MMCS


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 Post subject: Re: Flattened auxiliary battery - any consequences?
PostPosted: Fri Apr 17, 2020 11:22 am 
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Joined: Fri Apr 17, 2020 11:15 am
Posts: 9
Hi all,

I'm new here, so please go gently with me.

My wife's Outlander PHEV recently wasn't used for a few days, and wouldn't start owing to a flat 12V battery. Breakdown man called out, and jump started it from his booster battery, took it for a drive, all good.

Roll on a few more days, and the same thing has happened again. Definitely no lights left on etc.

Not ideal, but I thought I'd get myself a Jump Starter booster battery, just in case this might become a regular occurrence. I tried to jump start exactly per all the instructions, and absolutely nothing doing. My sense is that the 12V battery is more flat this time. There are absolutely zero signs of life on pushing the start/stop button.

Does anyone have any suggestions for me please? I should also add that I have quite a swanky trickle charger too, capable of a charging cycle specific to an AGM battery etc. I hooked this up to the +ve in the fuse box and the recommended earthing point, but it appears not to even recognise the battery, backing up my notion that it is completely flat.

Is there a way to directly hook up to the 12V battery in the boot? (which I can't open unless there is a mechanical way of doing so somewhere). Apologies for all the newbie questions. Thanks in advance for any advice.


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 Post subject: Re: Flattened auxiliary battery - any consequences?
PostPosted: Fri Apr 17, 2020 4:21 pm 
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Joined: Wed Jul 31, 2019 8:16 am
Posts: 209
Remove the carpeted floor, and then only a handful of bolts secure the moulded plastic section under that.

I would buy a basic Digital Voltmeter for a fiver and measure the battery voltage, which gives a good indication of whether it's Charged/Discharged/Doorstop.

https://haynes.com/en-gb/tips-tutorials ... ar-battery

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 Post subject: Re: Flattened auxiliary battery - any consequences?
PostPosted: Fri Apr 17, 2020 5:46 pm 
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Posts: 529
Location: Australia
Common wisdom is that a lead acid battery is not much use after it has been run down to zero.

Probably time for a new one.

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 Post subject: Re: Flattened auxiliary battery - any consequences?
PostPosted: Sat Apr 18, 2020 1:05 am 
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Joined: Mon Mar 12, 2018 2:18 am
Posts: 560
Location: Yorkshire end of M1, UK
It should start with a booster battery connected whatever the state of the 12V battery, even if it's flat. All it has to do is fire up the computers and connect the drive battery so there's not a huge current draw like a regular ICE. It doesn't care where the power is coming from as long as there's enough connected into the circuit via the jump-lead connections.

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 Post subject: Re: Flattened auxiliary battery - any consequences?
PostPosted: Sat Apr 18, 2020 1:21 am 
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Joined: Fri Apr 17, 2020 11:15 am
Posts: 9
Thanks very much for the quick responses.

I’m not sure why it won’t jump start then. I’ll try again. Out of interest there’s a similar metal bracket to the earthing point recommended in the manual on the same side of the engine compartment as the fuse box (where the +ve connection is); should this suffice? The Jump Starter battery leads aren’t particularly long.

Putting a meter across the 12V battery sounds like a good idea. Any suggestions as to how I open the boot with no electrics at all?

Thanks again everyone. I’ll report back.


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 Post subject: Re: Flattened auxiliary battery - any consequences?
PostPosted: Sat Apr 18, 2020 2:01 am 
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Joined: Wed Jul 31, 2019 8:16 am
Posts: 209
I would imagine that PHEVs with electric tailgate will have a manual opening handle on the inside.

Instead of removing the floor, buy the DVM and measure the volts across the jump point and earth with the 12V charger attached.

If the battery is taking a very large charge current the charger volts may be dropping too much.

Try jump starting with the battery neg disconnected in the boot, get the ICE running, then reconnect the earth.

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 Post subject: Re: Flattened auxiliary battery - any consequences?
PostPosted: Sat Apr 18, 2020 2:07 am 
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Joined: Fri Apr 17, 2020 11:15 am
Posts: 9
Thanks Michael. I’ll give it a go and report back.


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