Battery ballancing if there is no error code

cosminman · May 29, 2017

R-P said: ↑

I bought a few iMax B6 chargers (similar to your Turnigy) to do the same: preventative maintenance on my battery pack.

I started with bicycle NiCd (5Ah) and NiMH (10Ah) cells to get some feel for it and am glad I did.
I have an iMax 50W (charges at a maximum of 50W or 5A, whichever is the limiting factor) and two newer 80W ones (charges at 80W or 6A, whichever is the limiting factor).
The 50W version has no trouble sensing the delta V (on Auto, iirc it is set to 7mV/cell). The 80W versions never stop and always run into the capacity limit (even when set at twice the Ah rating of the cells, regardless if using Auto or 5mV/cell)
After doing research, I found information that a delta V can be hard to detect when the charging current is too low*. Advice was to use 0.5 to 1C to make sure it would be enough to sense the delta V.

Can someone confirm this charge-current vs delta V vs capacity relation?

I had hoped to use the 80W chargers as they can also discharge up to 10W, so I could simply cycle one Prius module per 80W charger and come back after 3 days with a nice list of discharge capacity and energy fed into the module for e.g. 4 charging cycles.

For now, the conclusion is that the 80W versions are worthless unless I can use them with a temperature sensor and skip the delta V meaasurement. So for now the project is shelved and I am following this thread with interest.

* the 50W versions charges the 10Ah cells with 2.5A and stops at rated capacity (+10% or so) as expected. The 80W version never stops, regardless if using 2.5 or 6A charging current on the same cells. I tried this on 10 cells (12V) and tried the 6A charging on 5 cells (as with 10 cells you would run into the 80W charging limit and not quite reach 6A).
Click to expand...

Hello

Yes, I concluded the same. If charge current istoo low it will not sense the deltaV. This is why I went with 5A.

Yesterday I put the battery on the car, andit works ok.

Trimis de pe al meu HUAWEI VNS-L21 folosind Tapatalk

Battery ballancing if there is no error code

cosminman Junior Member

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Battery ballancing if there is no error code

cosminman Junior Member