UPS Reading battery voltage wrong - Way bellow reality - NCR18650B Cells

[pedroo84]

Hello guys, I'm a noob with upsplus, but quite experienced with 18650 cells and projects.

I just got my Upsplus running with a Raspberry Pi, but somehow the battery reading is completely wrong,
I've fully charged my batteries with a external 18650 charger (Opus BT-C3100) but once inserted in the Upsplus, the reading is about 3.6v.

Have anyone experienced such issue?

The cells are brand new panasonic NCR18650B, I've also tried to discharge them on the Opus, and the reading was way bellow reality as well. (2.9v)

Of course I double check that with the multimeter, and the readings on the Upsplus are always way bellow.

[peacho10]

Hi, i have the same problem.

What I do for what functions is: turn off the ups (bus.write_byte_data(DEVICE_ADDR, 24,120)), remove the power, remove the batteries, put the batteries back and finally, put the usb power. It doesn't always work the first time. And other times, it shows the correct voltage and as the days go by, it shows 3.6 volts again.

[hellresistor]

I Think 18650 is not same as NCR18650B ...