The Battery board can be used with an external battery to increase runtime of your Edison which can be plugged in with a micro USB cable to charge. Additionally, the power switch removes the battery from the Edison while allowing it to charge via the microUSB cable.
If you need more battery life, it is possible to gently peel the battery off, de-solder the wires, and replace it with a larger cell. If you remove the battery, it is also possible to expose the expansion header to continue stacking blocks.
It may be necessary to find an alternative mounting point for your battery in this case. Go wireless with Edison!