There are several ways to power your Hexabitz modules and arrays. 

1. Coin cell battery holder modules (H04R1, H04R2): The output voltage is provided through Hexabitz SMD edge-pad connectors: 3.0V (in H04R1) and 3.3V (in H04R2 on top and GND on bottom. You can solder multiple modules together to achieve more capacity. Note: H04R1 gives you 3.0V which might not be enough to run all module functionality. H04R2 generates a 3.3V through an linear regulator (LDO).
2. USB-UART converter modules (H1AR1, H1AR2, H1AR3) connected to a computer USB port or a USB power bank. These three modules generate 3.3V on module power pads from the 5V USB source when you close the PWR jumper.
3. USB-UART 3.3V prototype cable. You can the USB-UART prototype cable to power your modules as well as communicate with them. Make sure the cable VCC output is 3.3V! Connection can be done either via 2-pin header connectors or Hexabitz BitzClamps.
4. Using DC-DC power module (H03R0) with AC/DC wall adapter.
5. Using DC-DC power module (H03R0) with 9V battery.
6. Using DC-DC power module (H03R0) with LiPo (lithium polymer)/LiFe (lithium iron phosphate) batteries – 2S (two series cells) or more. This is a good solution to get more current in a smaller size/weight.
7. Using DC-DC power module (H03R0) with DC power supply or any other DC source > 5V.
8. Power your modules directly with single-cell LiPo/LiFo battery. A single LiPo/LiFo cell is usually 3.5-4,2V. Thus, you will need to add a diode in series to get ~0.5V voltage drop and keep voltage level appropriate for the MCUs. This configuration saves you the cost and size of a power module.