This is a unique two-cell AA battery holder. The 6" (~150mm) cable has been terminated with a JST-PH connector.
We used to recommend using this battery pack with the BBC micro:bit but due to inconsistent JST connector sizes from our supplier (just enough for it to get stuck), we no longer do. If you are looking for a battery pack that is a bit easier to plug and unplug from your micro:bit, we recommend picking up the AAA-sized version instead!
Note: Please keep in mind that JST connectors are not suited for constant and repeated removal and insertions and may wear out over time.
If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Noob - You don't need to reference a datasheet, but you will need to know basic power requirements.
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I bought this for my first micro:bit. Not worth the time wasted just to unplug it because of the two protruding bits on the connector. I'll use other power alternatives instead.
Just a bit larger than 2 AA batteries. Kidding... the one at my desk is roughly ~2.25" x 1.25" :p. If you need more exact dimensions, let us know.