I have several batteries that have started rapidly flashing the 4th red light on it while the battery is fully charged. When plugged in to a brain it keeps the battery on for a few seconds then it dies. According to this https://kb.vex.com/hc/en-us/articles/360035589652-Interpreting-V5-Battery-Lights-and-Errors it means the battery is critically low but the batteries are fully charged. I have able to get two to connect to battery medic and one has 150 under voltage errors but everything else is fine and then the other one has 4 over volt errors and 145 under volt errors with everything else healthy. The other 6 I can’t keep on long enough to run battery medic. I’ve done some searching but can’t find anything solid on what could be causing this and what to do.
1 Like
One of my teams had a similar issue a few years ago, and the issue was the battery cord was damaged. When I say battery cord I am referring to the cord that connects the battery and the brain to provide power to the brain. I would try replacing the battery cord and trying again, but if that does not work I have no clue.