amiralnar
Posts: 19
Joined: Thu Jul 15, 2021 7:34 pm

Re: PHEV watchdog state of health doesn't match the dealer's health check, suspicious or not?

Thu Dec 23, 2021 2:46 am

adrianvdb wrote:
Tue Dec 21, 2021 2:41 pm
Hi,

I found out that the OBD dongle still reads the same 91% SOH, so it doesn't seem like the battery pack has been swapped.

So, that boils down to the big question: why does the battery check from the dealer come back at 76% SOH, while the OBD read-out shows 91% SOH?
I have to admit that I'm not super confident on how to interpret all the data from the PHEV watchdog.

@amiralnar I hope these were the screenshots you were hoping for. Thanks for actively following this thread!
Well it's look like this is a good brand new battery, replased this year.
To confirm that look at barcode sticker on the lateral side of the battery. It should be something like 20/01 to 20/12

greendwarf
Posts: 2394
Joined: Tue Aug 05, 2014 1:32 pm

Re: PHEV watchdog state of health doesn't match the dealer's health check, suspicious or not?

Thu Dec 23, 2021 6:21 am

If the last picture is the dealer's result then the Watchdog results of 36.5 & 91.3&% are there - just not together.

Daixiwen
Posts: 17
Joined: Mon May 25, 2020 4:42 am

Re: PHEV watchdog state of health doesn't match the dealer's health check, suspicious or not?

Mon Jan 03, 2022 2:29 am

Your screenshot from Phev watchdog shows 346 days for the age of the battery. If it hasn't been swapped, it means that someone did a BMU reset about a year ago without properly reprogramming the BMU, and most probably without doing a dbcam afterwards to measure the actual battery capacity. And in that case yes, the capacity reported by the BMU (and Phev Watchdog) is higher than the actual one.
I'd definitely look on the side of the car and check the actual manufacture date of the battery to be sure.

If it's indeed the old battery and the reported capacity is wrong, you can drive the car like that (and it has for almost a year!) but you risk damaging the battery by discharging it more than what was designed. If possible you should take it back to your dealer and ask him to do a proper battery calibration procedure (see A.2 here: https://www.richi.uk/p/mitsubishi-outla ... l#phevfaqA ) and then both the dealer and phev Watchdog should report the same capacity.

adrianvdb
Posts: 7
Joined: Thu Dec 09, 2021 1:50 pm

Re: PHEV watchdog state of health doesn't match the dealer's health check, suspicious or not?

Mon Jan 03, 2022 11:08 pm

Thanks Daixiwen! I haven't driven it for 50km purely electric yet, so I'll see if I can get a number on actual driving range on the battery. For what it's worth, the board computer tells me I've got 51 km range when it's fully charged.

I think I found the sticker you were talking about, hope it's the right one. I attached it below.

The previous screenshots I posted were both from the PHEV watchdog app. The dealer gave me a shitty piece of paper stating 76% state of health, with all the fields like make, model, VIN, etc. left blank... :roll:

I'm very curious to hear now if I've found the right sticker, and if the 20/12 translates to December 2020... If so, that that mean that I accidentally found an old car with a new battery? :) That also means the dealer ripped me off by not testing the battery but giving me a dummy piece of paper.
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Daixiwen
Posts: 17
Joined: Mon May 25, 2020 4:42 am

Re: PHEV watchdog state of health doesn't match the dealer's health check, suspicious or not?

Tue Jan 04, 2022 1:28 am

Yes,it definitely looks like you really got a one year old battery! Congratulations! Now the question is how the dealer got that strange battery health report.

adrianvdb
Posts: 7
Joined: Thu Dec 09, 2021 1:50 pm

Re: PHEV watchdog state of health doesn't match the dealer's health check, suspicious or not?

Tue Jan 04, 2022 1:40 pm

Hi,

Let me show you the battery test report the dealer gave me. I reckon they took an old one and removed the manufacturing year, type and VIN from the form. Anyway, I'm this turned out all right, but I won't be buying another car from them!

Just an FYI, I love the car, it's going great! No regrets yet buying the Outlander PHEV :)
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Daixiwen
Posts: 17
Joined: Mon May 25, 2020 4:42 am

Re: PHEV watchdog state of health doesn't match the dealer's health check, suspicious or not?

Wed Jan 05, 2022 1:19 am

The battery capacity in Ah matches almost the value from Phev Watchdog and it's probable that the BMU decreased the capacity by 0.1 Ah between when the dealer printed the paper and when you got the battery health report on your phone. So the dealer probably just extracted the capacity from an ODB reader, just like you did.
I have no idea what "battery capacity sustainability" actually means, maybe someone else knows? But the reported 36.6Ah is 91.5% of the original 40 Ah capacity, not 76%

The dealer clearly has no clue, but there doesn't seem to be any discrepancy if you look at the correct value. It's still rather strange he didn't know the battery had been replaced.

Enjoy the car :)

adrianvdb
Posts: 7
Joined: Thu Dec 09, 2021 1:50 pm

Re: PHEV watchdog state of health doesn't match the dealer's health check, suspicious or not?

Wed Jan 05, 2022 12:27 pm

Wow, I completely missed that fact, I didn't think about comparing the amp hours, instead I've tunnel-visioned on the state of health. But you're right, it says "battery capacity sustainability". I've never heard of that before, and they definitely sold it to me as a state of health, as that was explicitly what I asked for, and what they sold me.

Anyway, that was an interesting plot twist, and I think you're right.

I have no clue what "battery capacity sustainability" means, but this website explains it like this:
Mitsubishi PHEV, battery cell data down loaded, battery capacity sustainability test (battery life remaining), Mitsubishi states 8-10% depreciation over the first year from new then approxiatemly 4% depreciation every year after.
Source: https://www.incarautomotive.co.nz/

That does make it sound like State of Health to me... Maybe they calculated it based on the newer, bigger 13.4kWh battery packs?

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