Boards experts wanted

[mc viper]

Hello mates!
I would like to insert a board, the sx550j, in a self-built box that I will power with a type 2s battery.
This board would allow you to recharge the two batteries via USB3 cable in a balanced manner. My problem is that I can not find on the board where to connect the "balance line for charger".
Connecting the USB cable I find 8,2volt between the + and the -, so I could load the two batteries in series, but it is a solution that I prefer to avoid; rather I would insert an unaesthetic 3-pin socket to load externally as is used to charge the 2s batteries.
But I hope that there is someone who can solve the mystery and avoid a hole that I would not like to do.
I think that the thinner white cable is an antenna for Bluetooth.
I thank you in advance for your courtesy!

 

[mosfetius]

I'd say it was the white wire that connects between the cells, looks as if the board is common ground so that's the - took care of and the + will be connected through the board

 

[crustyfolker]

I am having a mod made with the 550j inside so i will tag Stu and ask him if he can help. @vapesmarter can you advise here.? thanks

 

[mc viper]

I've also the idea that the thinner white cable can be used for the balanced charge, but i mesured 8.2v with the +red and 0v with the - black. I'd expect 4.1v in both measures, but maybe it's not the right way to see how it work. For this reason I think it's for the Bluetooth, but not sure of that...

 

[mosfetius]

I've also the idea that the thinner white cable can be used for the balanced charge, but i mesured 8.2v with the +red and 0v with the - black. I'd expect 4.1v in both measures, but maybe it's not the right way to see how it work. For this reason I think it's for the Bluetooth, but not sure of that...

It shows you in the diagram

 

[mosfetius]

The Bluetooth module is the blue axillary board on the actual board which will have an Ariel on board like pictured

 

[vapesmarter]

the white thin cable is the balance charger the negative connects to both battery and atty but you have a dry joint on the ground I would sort that if I was you

the large white wire at the top of the board is the positive atty fire connection

the red wire is battery positive only the positive mind you, its more of a heavy awg cable

 

[mc viper]

... I was a little scared to burn the board...but you are right. It's its purpose! I have the confirmation of the screen that now shows two batteries in charge.
Thank you a lot @mosfetius.
The people of POTV are ever the best. You can always count on them!

 

[mc viper]

Thanks also to @crustyfolker and @vapesmarter[emoji6] [emoji106]