beagleboard / beagleboard/librobotcontrol

rc_battery_monitor reports 4 cells with nothing plugged in

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Description

**Describe the bug**
rc_battery_monitor reports the wrong number of cells.

**To Reproduce**
Steps to reproduce the behavior:
1. run "sudo rc_battery_monitor" at any time with approximately 12.0v plugged into the barrel plug on the beaglebone. No battery is plugged into the JST connector
2. the output says: \
2S Pack Jack #Cells Cell\
8.05V 12.25V 4 3.06V\

**Expected behavior**
The program will report "zero cells" or report "undetermined".

**Screenshots**
If applicable, add screenshots to help explain your problem.
![image](https://user-images.githubusercontent.com/42623372/55812190-23a0de80-5ab0-11e9-97c2-21bd656d8b10.png)

**Platform information**
Debian Image 2018-10-07

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