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BBC micro:bit battery power

spmbrown

Not asking about power via USB micro connector. What kind of JST connector is required? There are lots of different connectors known generically as JST.

 

Does anyone know the tolerance +/-V for battery supply. Is there a voltage regulator on the board?

 

The reason I require this information and the reason it should have prominence in product specifications and FAQs is to know whether rechargeable batteries may be used.

 

Can I use two NiMH? How many? 2 x 1.2V = 2.4V or 3 x 1.2V = 3.6V

 

What about LiPo batteries e.g. from mobile phones or those used for RC models (for example) at 3.3V & 3.7V

 

If anyone can tell me specifically which JST connector to use and what battery voltages are OK, I can make and/or re-purpose my own battery packs.

 

Stephen

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  • 0 in reply to gadget.iom

    Interesting info.

    As you say, that will likely stress the parts if the circuit is not designed for this.

    Just checking, looks like the NXP chip on-board is rated up to 3.6V for correct behavioiur, but behaviour is undefined but won't cause damage up to 3.8V. Beyond that damage may or may not be caused for that chip, in the short term or over a long term.

    In practical terms, I would just use a 3V or 3.3V regulator. Since it is designed for connecting to a 2xAA battery pack, 3V is a known good voltage to select for the regulator if a higher voltage source needs to be used.

    A LiPo cell directly connected is not advisable given what information we have currently, since it has such a wide voltage range, up to 4.2V.