Can you parallel 2 battery packs with 1 BMScommon port and the other separate?

[brone]

Sorry if this was asked before.

Can you parallel 2 battery packs with 1 bms that has a separate charging port and the other one doesn't ?
This will only be connected like that when discharging the battery packs.

Also forgot to mention 1 of the packs has newer cells and also 1p bigger capacity than the old one - I assume they would balance out each other voltage-wise when discharging?

 

[fechter]

Yes. I have something like that on my Sur-ron. If you charge through the two port pack, you can leave them connected during charging. If the packs are too dissimilar, one pack will do more work than the other one and you may get some charge shuttling between the packs. This isn't terrible, but will reduce the efficiency a little.

 

[gromike]

Same basic chemistry of the two batteries' cells?

 

[brone]

Same basic chemistry of the two batteries' cells?

1x 14s5p lg mj1 pack
1x 14s6p lg mh1 pack

Same voltage, same liion chemistry

 

[Zambam]

Sorry if this was asked before.

Can you parallel 2 battery packs with 1 bms that has a separate charging port and the other one doesn't ?
This will only be connected like that when discharging the battery packs.

Also forgot to mention 1 of the packs has newer cells and also 1p bigger capacity than the old one - I assume they would balance out each other voltage-wise when discharging?

Can you clarify? The way I read your 1st sentence, one pack has a BMS, the other one does not. One pack has a charging port, the other one does not.

 

[brone]

Can you clarify? The way I read your 1st sentence, one pack has a BMS, the other one does not. One pack has a charging port, the other one does not.

Both of them have BMS's.

1 of the pack has the older style separate-port (separate charging cable) BMS

The other one has the newer common-port where both discharge and charge are the same cable

 

[Diggs]

I did this for a while. Same 14s except 4p and 5p. The 4p was a Luna pack with separate charging port which I used to charge both packs. Problem was that the output of the 4p Luna pack was always less that the charging input. The other pack (5p) would never fully charge or balance unless I pulled them apart. Now I have a 5p and 6p each running 2-wire BMS and no voltage issues. They are both always the exact same.