Lithium battery BMS behaviour

[anso-engineer]

Hello, yesterday I have challenged some BMS issues, but afterwards I have found this is probably OK...
I have connected 18650 3.2 battery and  later 26650 3.2 battery to the smal BMS PCB, in the package was only pcbs, so I solder nickeled strips to board and welded strips to the battery respectively. In the end I got I bundle 18650 and one bundle 26650.

Afterwards, I have checked voltage on P+ and P- contacts. Zero volts!

• B+ and B- clamps 3.2V - OK
• P+ and B- 3.2V - OK
• B+ and P- - 0V

Frislty I assembled 18650 there was clear voltage between P+ and P- ,but not for the case with 26650.
I connected smal diode between 26650, P contacts, it didn't lighted. Afterwards I connected 0.2A load between P+ and P- and load was detected.

I can't have other explation as 26650 has some internal limitation or something as this.

[sleemanj]

It's not too easy to follow your post, but  most likely you are seeing the result of battery protection.  When first connected, or after a low voltage cut off, such protections usually require a charge voltage to be connected to wake them up.

[anso-engineer]

Maybe I should somehow read this tiny values of components and it helps understand something.
And yes, I will check it after first try of charge.

[ME]

is it for an fpv drone battery?.