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by Gary12345
Thu May 30, 2019 4:11 am
Forum: Batteries and Battery Management
Topic: Another i-MiEV Battery Pack Failing...? Help!
Replies: 4
Views: 316

Re: Another i-MiEV Battery Pack Failing...? Help!

Hi there, I've fixed the fluctuating voltage issue (caused by failed chip in the battery pack) on my i-miev and from looking at your pictures it is pretty certain that you have a cell which has a low capacity compared to the others. The next task would be to remove the main drive battery and find th...
by Gary12345
Fri May 17, 2019 4:17 am
Forum: Batteries and Battery Management
Topic: Is my battery dying ?
Replies: 59
Views: 9008

Re: Is my battery dying ?

Sorry my cells are still not here, i'm relying on a favour to get them shipped 400 miles for free, so basically have to wait until the guy is close to me to get them ! Hoping for soon.

Thanks.
by Gary12345
Thu May 02, 2019 6:02 am
Forum: Batteries and Battery Management
Topic: not charging my iON, cell or CMU or BMU problems
Replies: 76
Views: 9701

Re: not charging my iON, cell or CMU or BMU problems

Hi, Sounds reasonable - the battery pack is fairly tall so I ended up with blocks under the wheels - 12" high both sides, still the pack could not slide out, had to put another couple of inches under the wheels one side to get it out so you may need blocks to put the axle stands on, but see how...
by Gary12345
Tue Apr 30, 2019 6:18 am
Forum: Batteries and Battery Management
Topic: not charging my iON, cell or CMU or BMU problems
Replies: 76
Views: 9701

Re: not charging my iON, cell or CMU or BMU problems

Hi, About the diagram posted by Kiev, does it match in your experience ? So my faulty module (CMU 10 in diagbox and cells 71-74 in Canion) would be right under the passenger seat ? I can put my car on stand no problem, but I have no clue how to support and lower the pack once unbolted :/ Well it de...
by Gary12345
Tue Apr 30, 2019 6:15 am
Forum: Batteries and Battery Management
Topic: not charging my iON, cell or CMU or BMU problems
Replies: 76
Views: 9701

Re: not charging my iON, cell or CMU or BMU problems

Are you saying only one is needed to switch the car on (without "ready") and read values with Canion ? In that case, which one is it ? Hi, It will not go to ready without the big orange cables connected but all you need is to run diagnostics to check if you have identified the correct CMU...
by Gary12345
Fri Apr 26, 2019 6:16 am
Forum: Batteries and Battery Management
Topic: not charging my iON, cell or CMU or BMU problems
Replies: 76
Views: 9701

Re: not charging my iON, cell or CMU or BMU problems

Since it is likely you cannot see the failure (for me the chip looked fine but did not work properly) If you want to confirm that you have the correct battery module, just disconnect the little communications connector, then reconnect the battery pack multi plugs and check the battery voltages, the ...
by Gary12345
Fri Apr 26, 2019 6:14 am
Forum: Batteries and Battery Management
Topic: not charging my iON, cell or CMU or BMU problems
Replies: 76
Views: 9701

Re: not charging my iON, cell or CMU or BMU problems

I do not know, as of now, where is this board physically located. Any pointer to this information would be greatly appreciated. Hi, Your videos show exactly the same issue as I had, where voltages jumped up and down, mine was also CMU10. I would not buy a replacement CMU, instead fix the one you ha...
by Gary12345
Tue Apr 23, 2019 3:02 am
Forum: Batteries and Battery Management
Topic: not charging my iON, cell or CMU or BMU problems
Replies: 76
Views: 9701

Re: not charging my iON, cell or CMU or BMU problems

** Just realised this is a really old thread - note to anyone else reading!! ** Hi, i just fixed the same issue on my i-miev. It is failure of the voltage monitoring chip on one CMU, the board in one of the battery modules. Mine was also pack 10, so it seems these pack 10 chips like to die. I got a ...
by Gary12345
Thu Apr 18, 2019 2:45 pm
Forum: Batteries and Battery Management
Topic: Is my battery dying ?
Replies: 59
Views: 9008

Re: Is my battery dying ?

Oh and i've got a dual 10A RC charger and a separate 10A discharge capacity tester, so in ~5 hours I can do 1 full charge, 1 full discharge and a storage charge (50% charge once they have been tested).
by Gary12345
Thu Apr 18, 2019 2:39 pm
Forum: Batteries and Battery Management
Topic: Is my battery dying ?
Replies: 59
Views: 9008

Re: Is my battery dying ?

What voltage are you planning to discharge them to when testing their capacity ? I will charge to 4.1v and then discharge to 3v. The Yuasa spec sheets show that they test between 2.75-4.1v but there is very little below 3v. That should give me a good idea if the cells are usable in a car. I don't h...

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