u/Le-Creepyboy

Hi, i got this external power bank a while ago (zendure supertank 26800mah)

But it always cut power at around 45% remaining, and after a few months of light use, 60% was the minimum capacity before cutting... That was a phone charge and a half...

Today i decided to disassemble it, the thing is an actual tank, the plastic clips are behind a lip so impossible to remove without breaking, and both lids are glued to the battery with strong double sided tape...

The picture of the carnage...

I uncovered the BMS, and the individual battery tabs were easy to access, so I tested the cells individually:

• Bat 1: 3.97V
• Bat 2: 3.99V
• Bat 3: 4.10V
• Bat 4: 0.97V

There is of course an imbalance, is bat 3 too high of is it acceptable ?

Do I need to change bat 4 or is there a way to revive it ? I have an RC battery balancer, it might be able to revive the pack ?

As you can see behind the BMS they are 4 pouch style lithum batteries:

BMS

Here are the pics of the main pcb assembly :

USB C in and out

Assembled view of the usb assembly.

Thanks for the help.

Hi all!

A few years ago I crashed my fpv drone (wizard X220S) and I after all those years I wanted to get back in the hobby.

I upgraded the cam to a runcam racer 5, and connected the RX and TX pins to UART1 on my FC according to the user manual.
I updated the firmware in Betaflight to the latest version.

I'm having the issue when I try to configure UART1 to control the cam (especially remove its integrated OSD to remove the watermark) but the option is greyed out, all the options are available except runcam and OSD FrSky. I can't include a screenshot because Reddit says that I don't own the media (??)

FC is relatively ancient (Omnibus F4 V3) and I can't find a straight answer online...

Does that mean my FC is too old? And I need to buy the remote or can I just hook onto UART with an esp32?

Thank you guys