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The Turtlebot dashboard displays battery info by parsing the contents of two files...

1) /proc/acpi/battery/BAT0/info

On my laptop, the contents of that file are... (note values may vary)

present: yes design capacity: 4400 mAh last full capacity: 4370 mAh battery technology: rechargeable design voltage: 11100 mV design capacity warning: 215 mAh design capacity low: 150 mAh cycle count: 0 capacity granularity 1: 65 mAh capacity granularity 2: 4155 mAh model number: AS09A41 serial number: 2477 battery type: LION OEM info: SONY Corp

2) /proc/acpi/battery/BAT0/state

present: yes capacity state: ok charging state: charged present rate: 0 mA remaining capacity: 4370 mAh present voltage: 12493 mV

If either of these files do not exist, or your battery reports charge in a different way, you will run into issues (until this is fixed). You should check out this answer and see if it applies to you: