Mitsubishi Outlander PHEV Forum

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 Post subject: Re: Lindqvist method : DIY BMU Battery Reset
PostPosted: Tue Aug 13, 2019 6:26 am 
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Joined: Fri Jul 05, 2019 7:35 pm
Posts: 118
Location: Aussie Land
elm70 wrote:
About the D method ...

I was thinking .. can be simulated a low voltage 12v battery with a big capacitor .. like a super cap ?

I think this can be easily put down in natural way to around 8v (or whatever is needed) .. without any side effect.



Good idea but I am jinxed again.
I have two 500 Farad super caps here but they are 2.7V each so only good for 5.4V.
Why didn't I order 3 back then? :slap_on_the_head:

Will take at least three weeks to get more from China.

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 Post subject: Re: Lindqvist method : DIY BMU Battery Reset
PostPosted: Tue Aug 13, 2019 12:13 pm 
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Joined: Mon Mar 12, 2018 3:12 pm
Posts: 18
Location: Calgary AB
MadTechNutter wrote:
Bit astonished people are so quiet about this here.

Could anybody who intends to do this procedure please read with the watchdog the cell voltage when their drive battery shows 'empty' before the procedure and the empty voltage value after a successful reset?

...and of course their trip odometer before and after, not the displayed EV range but the actual kms driven from fully charged in EV mode until the ICE kicks in with light foot driving and then read the voltage on the watchdog, once stopped at a safe location of course.
Please voltages only, no % or Ah.
Thank you :)

If this really significantly increases the range on older batteries then I can only imagine this is possible by deeper discharge.
If the true SoC goes down to 20%, I have absolutely no concern as this will not degrade the battery and should still have enough reserve for any mishaps.
It seem obvious that the 'improvement" will degrade over time as this seems to be the way Mitsubishi had it designed but then I would actually consider building in a Reset button to discharge over a small resistor the capacitor for the SRAM that stores the BMU data after I disconnect the 12V battery.
We do this the whole time to clear the CMOS for the BIOS in Personal Computers.
The resistor is important in case the reset button is accidentally pressed with 12V battery or charger connected. 470Ω -1KΩ should be OK and then hold the button for a 10 seconds.

What I find a bit questionable is why the battery has to stay disconnected while it is charging after the BMU data is obviously erased.


Finally had a chance to run the battery down with the App HVAC after the reset.
My cell voltage is now 3.664 (2.3 kWh) when it shut the heater off. Was 3.794 (2.0 kWh) before the reset. (20.3%)

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 Post subject: Re: Lindqvist method : DIY BMU Battery Reset
PostPosted: Wed Aug 14, 2019 1:32 am 
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Joined: Mon Sep 26, 2016 11:18 pm
Posts: 1153
Location: Poland
I did update page 1 with the D method ...


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 Post subject: Re: Lindqvist method : DIY BMU Battery Reset
PostPosted: Fri Aug 23, 2019 5:17 am 
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Joined: Mon Sep 26, 2016 11:18 pm
Posts: 1153
Location: Poland
Up . Up ...

... everybody focus on D method ... while the original method and its short variation get dusted away :shock:


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 Post subject: Re: Lindqvist method : DIY BMU Battery Reset
PostPosted: Sun Aug 25, 2019 11:18 pm 
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Joined: Mon Sep 26, 2016 11:18 pm
Posts: 1153
Location: Poland
Update on my PHEV SOH :

320km or 25 days after and ~10 full charge (212Ah charged)

SOH dropped to 37.4 (5x 0.1Ah drop , after 1st charge I got 37.9Ah ..so possibly 0.1Ah drop already on 1st charge)

What I see, is that SOH drop after every battery full charge (almost all) .. if I partially charge the PHEV I don't get the SOH drop

Anyhow, per my calculation based on SOC changes after a 2h rest, my PHEV real SOH should be around 34.7Ah, so it is normal that SOH drop quickly now, since BMU can see that SOC and SOH are not matching at each charge

Still .. this allow me to use my PHEV battery down to real 25% SOC, so I can get easily over 45km EV range something almost impossible before.

Once the battery will go below 36Ah ... I will repeat the BMU reset procedure from page 1

I expect my PHEV should manage to keep above 36Ah for at least 5 months ... so I forecast 2 reset a year


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 Post subject: Re: Lindqvist method : DIY BMU Battery Reset
PostPosted: Sun Aug 25, 2019 11:19 pm 
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Joined: Mon Sep 26, 2016 11:18 pm
Posts: 1153
Location: Poland
...


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 Post subject: Re: Lindqvist method : DIY BMU Battery Reset
PostPosted: Mon Aug 26, 2019 10:46 am 
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Joined: Mon Aug 01, 2016 3:57 am
Posts: 36
elm70 wrote:
Update on my PHEV SOH :

320km or 25 days after and ~10 full charge (212Ah charged)

SOH dropped to 37.4 (5x 0.1Ah drop , after 1st charge I got 37.9Ah ..so possibly 0.1Ah drop already on 1st charge)


As a comparison, reset mine 2 weeks ago, and here are the rate cards:

Aug 13: 170,999km - 38.0Ah
Aug 14: 171,009km - 37.9Ah
Aug 14: 171,109km - 37.8Ah
Aug 15: 171,326km - 37.7Ah
Aug 16: 171,499km - 37.6Ah
Aug 18: 171,838km - 37.5Ah
Aug 21: 172,424km - 37.4Ah

By 21st, had a total of 96Ah AC charge and 84Ah DC fast charge. I can't recall when each drop occurred, but I do know one of them was when I switched on after getting back to the car park in town, so it hadn't been on charge. Anyway, I reckon I am getting about another 6 to 7 Ah extra usage out of the battery (about 10km) - so pretty pleased!


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 Post subject: Re: Lindqvist method : DIY BMU Battery Reset
PostPosted: Mon Aug 26, 2019 6:16 pm 
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Joined: Fri Jul 05, 2019 7:35 pm
Posts: 118
Location: Aussie Land
2 weeks after reset:
37.6Ah, always very slow charge 5.3A, not always fully charged which is my intention but every day on the charger.
About 500km driven in EV mode, with exception of a few 5second bursts flooring the pedal for fun.

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 Post subject: Re: Lindqvist method : DIY BMU Battery Reset
PostPosted: Thu Nov 14, 2019 4:06 am 
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Joined: Wed Oct 10, 2018 3:11 am
Posts: 108
Location: Berkshire, UK
Thanks for everybodies posts. I'm torn as to whether to do this. I plan to possess my Outlander for a long time so don't want to damage the battery yet equally crave additional range (I am maybe 10km short each day with my work drive).

I think I will rest on luck; if the dealer will reset the BMS for me for free when I am in there for warrenty work then I will, if not i'll leave it.

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 Post subject: Re: Lindqvist method : DIY BMU Battery Reset
PostPosted: Tue Nov 26, 2019 1:29 am 
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Joined: Tue Nov 26, 2019 1:16 am
Posts: 1
Hi all,

After some deliberation, I decided to give this a go... I tried the original method a couple of times but battery still sat stubbornly on 34.4Ah (2014 plate with 140 000km, not bad), and I must have tried the short method a good 20 times - but no luck. I could hear the final relay on the car (which sounds like it is near the fuse box under the bonnet) clicking in before the charge started.

So I dug out an old 12v battery and managed to get enough charge in it to try the D method. Took a few goes to get the voltage right, but then all went well, display showed a ton of error messages and SoH at 40Ah. Charged full and today got an extra 5+km out of the battery, final cell voltage at 0% was 3.74V average and 0.013V max diff so quite reassured that I wasn't dangerously low.

I'll keep an eye on SoH and repeat in a few months most likely.

Thanks all!


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