I power my Circuit Playground Express with a Micro-USB cable and external battery.
This here is your standard A to micro-B USB cable, for USB 1.1 or 2.0. Perfect for connecting a PC to your Metro, Feather, Raspberry Pi or other dev-board or...
$2.95
In Stock
A smaller-sized rechargeable battery pack for your Raspberry Pi or Raspberry...
$14.95
In Stock
However, if you want to make the project more portable and compact, you can grab a lithium rechargeable battery and a switch that will fit nicely inside the case. Directions on that here.
Adding a battery and switch
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