[jobsdone]

You are right. I just tried it and could observe the following:

1. Voltmeter attached to red and black
2. Did the wiring as described by Y0SH1zzzx
3. Voltmeter show ~47V for 2 seconds
4. Voltage is dropping to ~31V for one second.
5. Steps 3 and 4 repeating over and over again (Voltage rises and drops again).

Why do I observe this behavior? Because there is no load attached?

How do I charge the battery? Do I keep your wiring (Y0SH1zzzx) and simply attach my charger to the red and black cable?

[Y0SH1zzzx]

Sadly I no longer have the batteries so I can't check my wiring, altough it does sound like what happened to me when I wired it wrong. Doesn't hurt wiring it wrong tho also overload protection still works btw. I should've posted a photo but now the phone with the photo is broken. You should get a stable voltage when it's wired correctly and as long as there aren't shorts with plus and minus there is nothing to worry about playing around with it. Sorry wish I still had the battery to help

And yes when it's a stable voltage you can just charge it like normal

[Cc201113]

I've had 2 of them and it has worked, just don't short plus and minus and it doesn't matter what you do with those other ones.

How do you charge this battery.

[Cc201113]

I've had 2 of them and it has worked, just don't short plus and minus and it doesn't matter what you do with those other ones.

How do you charge these batteries

[jobsdone]

FInally I had some time to get back to this topic. You are right @Y0SH1zzzx: If the wiring is correct (connect yellow and white wire to the red positive one and green wire to the black one) I get a stable voltage at the black and red cable!

Thus, if I like to charge, I will just keep the cabling connect yellow and white wire to the red positive one and green wire to the black one) and attach my charger with a max. of 54V DC to the black and red cable and the battery should be charged, right?

[Y0SH1zzzx]

Yes if it shows the stable voltage then you can safely charge with those connected at the same time, if I remember right it couldn't even charge without the still being connected with my charger because it couldn't read the correct voltage

[jobsdone]

This works, great! Thank you.

I noticed, that it is actually sufficient to ONLY connect white with red to enable the voltage output at red and black.

[Y0SH1zzzx]

That might be true but that other one might be for protection or something idk but I noticed that way it actually cut off when drawing too much power and you probably don't want a fire or a ruined pack, it might still work it's up for someone else to test tho

[jobsdone]

Makes sense. Thank you for your additional thoughts.

[scootertuning]

So no need to use CAN messages to activate these batteries to discharge (+charge), correct?
@alkyrion can you share the firmware dump you made pls? Its from the STM32 on the BMS, or?