Hey @jpearman, sorry to piggyback on this thread and bother you, but I have a similar battery issue. Some of my batteries are dying at what is displayed as around 50%, which seems a bit uncharacteristic of them. When they die, they display a red flashing LED in the fourth position at a very fast speed, and according to this, that means the battery is critically low.
As a side note, I’ve worked with our V5 stuff since our team got them and I don’t think we have ever reset the battery, so that shouldn’t be a problem.
I’ve tried the battery medic, and so I’ve inserted these two screenshots, which I think are probably most relevant. The other screenshots I have are included in a zipped folder further down.
This is the max battery power it got when I charged it all the way through, at which point it stopped charging (sorry I didn’t get a pic at exactly 100%, but this should be close enough).
According to this (that JPearman also posted), the pack voltage should reach 14.4V and the cells should reach 3.6 V. 
Then, I let the robot sit and run the battery down, and it died at around 47 % (it added an under volt error as you can see). I had to recharge the battery a little bit to reconnect to the computer and restart battery medic and I got this right before the battery died.
The cells are all fairly close to under volt shutdown.
Screenshots.zip (1.1 MB)
(the last three screenshots are from the restart after the under volt shutdown)
We started using this battery in April of 2019.
Do you have any idea what the problem is (or if there is a problem)?