Wiring advice needed for a 4s Li-Fe battery

[Mrsn]

So, i've got these 8 38120S cells, two pairs of 4 i connected in series, and the "new" two batteries i have connected in parallel, thus creating a 14.4v battery.
My question is, how should i wire the jst-xh connector? I've seen some video online that mentions connecting the first wire to the "main" battery negative, the next one to the same battery's positive, and the rest of them to the rest of the positive leads of the other cells. I've tried that, and when i try to charge the battery the charger says "battery cell error". Any help or advice would be greatly appreciated!

 

[john61ct]

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[john61ct]

You should have parallel pairs wired first into 2P groups, if 10Ah cells, then each group/pair acts as a single 20Ah cell.

Then those get connected in a series string of 4 group/pairs , 2P4S layout, rather than 4S2P.

Note you then can't monitor each cell separately

 

[john61ct]

5 wires, pack negative #1 say on the right then the junction between 1&2, then 2&3, 3&4 finally pack positive on the left is wire #5

 

[john61ct]

Look at BMS and balance charger wiring diagrams for 4S.

 

[Mrsn]

Thanks for the quick answers john! I eventually followed the diagram in the picture, but sadly I still get a "battery error" while connecting the balance connector to the charger! Any leads on what would cause this? Maybe it's the fact that I reversed the order of the jst-xh connector (I mean that the charger recognizes batteries 5-8 instead of 1-4)?
Perhaps I should use a different configuration?

Sent from my GM1913 using Tapatalk

 

[john61ct]

Hard to tell without being there.

Pics, diagrams?

What charger? have a good pack to test the charger with?

What voltage are each of the groups?

Do you have the paralleled-cells at the lowest level, or two 4S strings in parallel as your OP stated?