this post was submitted on 14 Jun 2023
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ErgoMechKeyboards

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Ergonomic, split and other weird keyboards

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Posts must be of/about keyboards that have a clear delineation between the left and right halves of the keyboard, column stagger, or both. This includes one-handed (one half doesn't exist, what clearer delineation is that!?)

i.e. no regular non-split¹ row-stagger and no non-split¹ ortholinear²

¹ split meaning a separation of the halves, whether fixed in place or entirely separate, both are fine.
² ortholinear meaning keys layed out in a grid

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Hey folks, I'm toying with the thought of a portable, wireless/BLE, 34 key split kbd. Most builds that I've looked at hide the battery. Questions:

  • Do you mount the batteries? If so, where? Examples?
  • Does it in any way impact the portability?
  • Are there any other notable differences (in comparison to a wired board) one should be aware of?
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[–] [email protected] 2 points 1 year ago (1 children)

Batteries require management with control circuitry normally on the MCU. This means you need to pick MCUs that support batteries.

You will also want a on off switch for the battery somewhere.

I always use LIR2450 button cell batteries where I can. The steel body makes them more resistant to damage where as pouch cells can't take much of a scuff.

They're very portable! Just make sure the battery can't be smushed if the board itself gets some pressure, and that it can't get poked by sharp / conductive things.

ZMK for the nice nano and XIAO nrf52840 should even report battery life! Your primary half (generally left) drains faster than the accessory half.

RGB / screens that aren't designed for low power are utterly destructive to battery life. I get ~1-2 weeks on 120mah splits. With RGB I'm lucky to get an hour.

You don't change these batteries as they're rechargeable. Most boards will function while recharging. I offer QI wireless charging on my boards if you request it.

[–] [email protected] 2 points 1 year ago

Searching for LIR2450 lead me to coin battery holder with on/off switch. I haven't seen a build with coin battery holders like this yet. I'm more curious now.

Thanks for the reply.