Sorry for the late reply. Had a problem with my meter test probes, all the values were off, so I had to get a replacement.
I have checked values on c7020, it is exactly 2ohms. Do you suggest i replace u7000?

(I have also recieved the replacement tvs diodes and installed it.)...

Voltage on sda, scl on mobo side reads about 3.5v. For battery side, I tested with working battery from similar laptop already.
I removed the tvs diode on sda/scl/gnd already (awaiting arrival of replacement part). Issue persists.

I have tried with a known working flex and battery, same result....

Hi, I have a mbp a1708 2017 that I am trying to fix.

(1.) It turns on fine on ac power when bms flex is unplugged.

(2.) I noticed when battery & charger is unplugged and reconnected, it turns on only after a few minutes but doesn't stay on battery power i.e. it turns off as soon as charger is unplugged and doesn't turn on until (2.) is repeated. During this time, health information and charging information are displayed and normal and battery charges but laptop turns off as soon as charger is disconnected.

I have reballed u7000, problem persists.
...

100FIX from Nigeria.
Regards.