We’re having issues with our batteries. We appear to be getting an under voltage error while the battery reports to be 3/4 charged. This is happening with the majority of our batteries, which were all bought in between December 2018 and November 2019. They were not used during the Change Up season. Four batteries failed to charge at all, and five seemed ok at first, but have been slowly decreasing in useable run time.
See video for more: V5 Battery Rip - YouTube
After running the robot for a short while, the robot turned off and the red light flashes 5 times per second (indicating low charge?). However, when we press the status button (the big one) all green lights shine indicating full charge, it then goes back to flashing red until we put it to charge. Then it shines 3/4 lights solid green, with the 4th flashing flashing green.
From the battery medic, it seems one of the cells is discharging much faster than the others.
We are running the latest version of the firmware, 1.1.0.
The brain seems to be drawing a large current (~1A) once it is unplugged from the charger. We tried with another brain, and with 0 motors and it drew 0.3A. Unplugging a motor decreased current by ~0.04A, and each solenoid ~0.02A. Not sure if this is relevant.
We are assuming it is a bad cell, as in Battery dying at high percentage - #13 by Totallynotarobot. But wanted to make sure before we start lamenting at the lack of availability of new batteries.