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Replying to @josecastillo
A lot of that 714µA on the M4 feather comes from the Neopixel; you could drop maybe 500µA from the budget by yanking it off. But even the M0 and Arduino: imagine a Feather shaped gadget with that small 400 mAh battery. It could last 24 weeks on one charge, with always-on display!
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