BMS battery

[dbar]

Yes every thing looked ok to my uneducated eyes. I'll check again when charge has finished. Up to 3.3v now.

 

[Deleted member 4366]

It'll rise quickly at first, but to get to 4.2v at .5A, it'll take 20 hours or more. After a couple of hours, you can turn the charge current up. after a bit more, you should be able to check that the switch works.

 

[dbar]

It will be tomorrow then.
Thanks for the guidance up to now.
It must be hard trying to explain things at a distance to people who really haven't got a clue.

 

[Deleted member 4366]

It's easy with you because you do what you're told and give concise answers. Also, I know that battery pretty well, which helps.

 

[dbar]

Started charging again this morning. I didn't want to leave battery unattended. The bank I'm charging is up to 3.9v and the pack voltage is up to 41.2v. The light on the battery now lights up. What next? Should I try to discharge it and then try with the normal charger?

 

[Deleted member 4366]

All the other cells are 4.1v to 4.2v, so you need to go right up to 4.2v to get it balanced. Can you estimate the total amp-hours gone in to it now and when it's finished? That will give an idea if it's OK.

 

[dbar]

It's still charging. Up to 4.03v now. Sorry don@t know amp-hours.

 

[Deleted member 4366]

What current are you charging it at and how many amp-hours is the battery?

 

[dbar]

I'm charging at 2.0amps. Battery is supposed to 14.5 amp. Cells are NCR18650PF.

 

[Deleted member 4366]

It should therefore take about 7 hours to charge. Anything significantly less would be worrying.

 

[dbar]

Up to now it probably been about 10 hours. Now up to 4.14v and pack voltage is 41.1v.

 

[dbar]

Fully charged now.

 

[Deleted member 4366]

Now you can try it. If next time you charge it, you get above 41.5v, it's probably fixed. It's still a bit of a mystery why that string was down unless it's powering the BMS.