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Author Topic: DS 2011 LOW BANK battery no 1  (Read 980 times)

Doctorbass

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DS 2011 LOW BANK battery no 1
« on: May 21, 2013, 11:02:32 AM »

 Few month ago, i had measured my 2011 DS battery that i suspected to have a low bank. I had discovered that at the end of the dishcharge ( when one or more cell bank reach the low voltage limit)  there was 400mW difference between this low bank while all the 13 other bank was all the same voltage ( 400mV higher)

Today i fully disshcarged my zero down until the battery cut ( fortunatly i was only 500m from home). I measured only 56.6Ah :(. Last year i had measured 59.7Ah. and the low cell bank that is still the bank no 1 is now 500mW lower. It droped by 100mV  from last year...
( see the attached picture of the MBB data i grabed:

Well i have to say that dissassembling the battery another time willl be a pain ::).. i have spare cell bank that's not the problem.. the problem is that i know i will make more improovement and that the battery will need to stay few days on the bench even if i open it again...  this mean no motorcycle ride :-\...

Unless i use the lazy solution.. wich consist of  connectin a parallel LiMn cell  with the same missing Ah than the low bank have to this low bank. ( fortunatly last time i opened it i have installed 30A anderson connectord for each of the 14 bank to be able to fast rebalance or monitor them...

Well at least i have two good solution... until i decide to begin the real big project ( upgrade to 100Ah 84V but keeping the actual battery) 8)

Doc
« Last Edit: May 21, 2013, 11:04:28 AM by Doctorbass »
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ed5000

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Re: DS 2011 LOW BANK battery no 1
« Reply #1 on: May 23, 2013, 11:07:07 AM »

Sorry to hear about that Doctorbass.  Don't you have a Cellmate meter that reads out the voltage of each cell?  I would think that if you had a weak cell in the one bank you should be able to see it.  Other than that can you use it with your booster pack until there's a better time (like winter ;D) to do a tear down?


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Doctorbass

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Re: DS 2011 LOW BANK battery no 1
« Reply #2 on: May 23, 2013, 10:39:33 PM »

yes i still can se it, i only loose few Ah on the 13 other bank that can not be usable due to that low bank cutting the power too soon.  i dont think i will investigate to find a low cell in the bank, too much time consuming, i will just replace that bank with a better one.. i have 2 spare 2011 battery in my lab ;)

Doc
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Zero Drag racing bike: 12.2s 1/4 mile and 7.3s 1/8 mile
https://youtu.be/iVMPBnfhukM
T w i t t e r  :     http://twitter.com/DocbassMelancon
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