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 Post subject: Drive battery degradation and replacement.
PostPosted: Mon Dec 24, 2018 6:00 pm 
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Joined: Thu Feb 26, 2015 5:58 pm
Posts: 874
Location: Near Port Macquarie Australia
Hi folks,

As my old degradation thread is now 36 pages :shock: long I will start a new one here as the old one has a lot of out of date information.

Now just to catch up of where I am currently with my oldest PHEV's drive battery which my oldest son now drives is we had below 80% SOH (about 77%) in Feb 2018.

After stuffing about with different dealers where the first could not get his MUT-III to communicate with my PHEV I finally got another dealer to get some tests done. It was there where they did a battery smoothing (cell balancing from what I could see) and a Auto Capacity Measured Procedure which empties the battery and measures what it takes to refill it and then adjusts the BMU SOH to include the new result. For me it took the SOH up to about 81% . Now the other day my son and I checked his drive battery and it was showing about 72% SOH so the gain did not last long so I will be trying to get a new drive battery before the 5 year warranty runs out in April.

But will have probably have to get another Auto Capacity Measured Procedure done again though. ;)

Regards Trex.


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 Post subject: Re: Drive battery degradation and replacement.
PostPosted: Mon Dec 24, 2018 7:10 pm 
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Joined: Mon Dec 16, 2013 1:18 pm
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Location: Netherlands
As I understand it it must be under ~26 Ah after smoothing and BMU adjustment to qualify for guaranty. I rather doubt that that will happen before April on your son's car. Note that the baseline of measurement is the actual SOH at delivery, not the theoretical value.
To give Mitsubishi credit: somehow they manage to compensate for battery deterioration. Mine is down to 28.3 Ah after five years and 120.000 km, but the actual range loss it not nearly as dramatic as one would expect.

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 Post subject: Re: Drive battery degradation and replacement.
PostPosted: Mon Dec 24, 2018 10:36 pm 
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Joined: Wed Oct 29, 2014 8:23 pm
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Location: Dee Why
jaapv wrote:
As I understand it it must be under ~26 Ah after smoothing and BMU adjustment to qualify for guaranty. I rather doubt that that will happen before April on your son's car. Note that the baseline of measurement is the actual SOH at delivery, not the theoretical value.
To give Mitsubishi credit: somehow they manage to compensate for battery deterioration. Mine is down to 28.3 Ah after five years and 120.000 km, but the actual range loss it not nearly as dramatic as one would expect.


That minimal reduction in range is my experience too. My battery reads just under 85% and last week I had to drive to the airport, something I only do a few times a year. It is 33km from my place and I usually arrive there with 8-10km left on the guessmeter. This last time however, it showed 18km left and this also seemed to agree with the battery indicator which was still about a third way up. I even had the aircon on. So, go figure. I could not test whether it had in fact that much left as I ended up waiting for about an hour and sat in the car with the aircon running. That took care of most of the battery capacity left.


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 Post subject: Re: Drive battery degradation and replacement.
PostPosted: Tue Dec 25, 2018 1:49 am 
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Joined: Mon Dec 01, 2014 11:30 am
Posts: 3404
Location: Netherlands, Utrecht area
jaapv wrote:
As I understand it it must be under ~26 Ah after smoothing and BMU adjustment to qualify for guaranty. I rather doubt that that will happen before April on your son's car. Note that the baseline of measurement is the actual SOH at delivery, not the theoretical value.
To give Mitsubishi credit: somehow they manage to compensate for battery deterioration. Mine is down to 28.3 Ah after five years and 120.000 km, but the actual range loss it not nearly as dramatic as one would expect.

26 Ah is Netherlands only. And here it is 8 years not 5.ah at delivery is irrelevant. The boundary is a absolute value, not a relative one. 26 = 26.

In Australia it "seems" to be 80% after 10 years. At least for a happy few. As in good will, no warranty ;)


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 Post subject: Re: Drive battery degradation and replacement.
PostPosted: Tue Dec 25, 2018 2:16 am 
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Location: Netherlands
Yes, I meant that the percentage may well be taken from the delivery value of approx. 37 Ah.
As for the 26, the boundary is indeed hard, but I think the measurement may be open to some interpretation, as one is measuring a dynamic process.
Glad to hear it is 8 years :)

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 Post subject: Re: Drive battery degradation and replacement.
PostPosted: Tue Dec 25, 2018 2:27 am 
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Location: Netherlands, Utrecht area
According to the TSB is is 70% of 40 Ah for MY16, 17 and 18 and 65% of 40 Ah for MY 14 and 15.

They use the result from right after DBCAM. Although ... when denying my claim they have used the SoH number from right after the DBCAM, which in my case has been a few tenths higher every time.


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 Post subject: Re: Drive battery degradation and replacement.
PostPosted: Tue Dec 25, 2018 4:19 am 
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Location: Netherlands
Well, it is not eight years old yet ;)

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 Post subject: Re: Drive battery degradation and replacement.
PostPosted: Tue Dec 25, 2018 2:35 pm 
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Joined: Thu Feb 26, 2015 5:58 pm
Posts: 874
Location: Near Port Macquarie Australia
jaapv wrote:
As I understand it it must be under ~26 Ah after smoothing and BMU adjustment to qualify for guaranty. I rather doubt that that will happen before April on your son's car. Note that the baseline of measurement is the actual SOH at delivery, not the theoretical value.
To give Mitsubishi credit: somehow they manage to compensate for battery deterioration. Mine is down to 28.3 Ah after five years and 120.000 km, but the actual range loss it not nearly as dramatic as one would expect.


Hello jaapv, how are you going?

Over here Mitsi Australia were "silly" enough to write on their website degradation is expected to be no more than 20% which IMO is probably not a directly expressed warranty but a lot of us took it as a safe reason to buy the PHEV and think we will not have excessive degradation. Looking back they probably should have not had that there (since taken down from what I can see) but it did help their sales I think.


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 Post subject: Re: Drive battery degradation and replacement.
PostPosted: Tue Dec 25, 2018 3:06 pm 
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Joined: Thu Feb 26, 2015 5:58 pm
Posts: 874
Location: Near Port Macquarie Australia
HHL wrote:
jaapv wrote:
As I understand it it must be under ~26 Ah after smoothing and BMU adjustment to qualify for guaranty. I rather doubt that that will happen before April on your son's car. Note that the baseline of measurement is the actual SOH at delivery, not the theoretical value.
To give Mitsubishi credit: somehow they manage to compensate for battery deterioration. Mine is down to 28.3 Ah after five years and 120.000 km, but the actual range loss it not nearly as dramatic as one would expect.


That minimal reduction in range is my experience too. My battery reads just under 85% and last week I had to drive to the airport, something I only do a few times a year. It is 33km from my place and I usually arrive there with 8-10km left on the guessmeter. This last time however, it showed 18km left and this also seemed to agree with the battery indicator which was still about a third way up. I even had the aircon on. So, go figure. I could not test whether it had in fact that much left as I ended up waiting for about an hour and sat in the car with the aircon running. That took care of most of the battery capacity left.


Gday HHL, been awhile.

My son would not agree with you at the moment. He started driving it full-time just after we did the Auto Capacity Measured Procedure, so about 81%, and came to me the other day saying it has noticeable lost range. That is the reason I checked the SOH using my copy of Evbatmon and OBD adapter.


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 Post subject: Re: Drive battery degradation and replacement.
PostPosted: Tue Dec 25, 2018 3:11 pm 
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Joined: Thu Feb 26, 2015 5:58 pm
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Location: Near Port Macquarie Australia
anko wrote:
In Australia it "seems" to be 80% after 10 years. At least for a happy few. As in good will, no warranty ;)


Hi anko. So who are the "happy few" you mention? Is this something I have missed? :?


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