Does your board refuse to charge all of the way to 100%? Normally, the battery should charge fully to 100% and stay at that level when the charger is unplugged. At times, the board can stop accepting charge between 70-99%
A few things to check are as follows:
Is your charger green turning red when the board reaches its max charge?
If your charger is turning green (Even if it stops charging before it is full) We know that your charger is NOT the culprit!
Does your charger have any light at all?
The charger light should be green when not in use, and red when in use and charging!
Have you left the board to charge over night?
This can fix the problem most of the time as the battery needs time to balance!