The Battery Module is designed as a power supply source for the battery-operated units. The integrated low-power buck converter provides an excellent efficiency from the four AAA 1.5 V Alkaline cells. It also features an extra 5-pin socket where you can connect a BigClown tag.
The load disconnect circuit can disconnect the batteries if any other power supply source is connected to the system (e.g. AC adapter or USB cable). The battery voltage can be measured on one of the analog inputs of the standardized header (P0/A0/TXD0).
If the for AAA batteries are not suitable for your application, you can use the external voltage input, which can handle up to 10 V. You can find the external input on the two pins in the middle. These pins are compatible with the popular JST connector used for Lithium batteries.
Another useful feature is a prototyping area for soldering your own circuits.
High-efficiency buck converter TPS62745 (TI)
Ultra-low quiescent current: 400 nA
Recommended battery types:
4x AAA 1.5 V Alkaline or
4x AAA Eneloop NiMH
Output supply voltage: 3.1 V
Battery disconnect circuit
Battery voltage measurement using an ADC input
Prototyping area for soldering custom circuits
One extra position for BigClown tag
Operating voltage range: 3.3 to 10 V
Operating temperature range: -20 to 70 °C
Mechanical dimensions: 88 x 55 mm
Note: Use firmware for node-battery-standard