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Request for hardware startup: a battery charge level indicator part under $5 (for both rechargeable sand non). and I had a brief slack discussion (see screenshots) on why this is a hard problem that’s important and useful to solve. Any bright ideas?
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Also, I think it's less the hardware cost and more needing to do expensive / long term studies on battery degradation which is a full system problem, eg: "This particular motor current spikes more which degrades the battery faster, hence the indicator is inaccurate / erratic."
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But surely a rough, conservative 0/1 “low battery” warning indicator would require much less precision? Choose from a dozen typical load profiles like “spiky”, “smooth” etc and hard-set during design. I’m surprised there’s basically nothing for sub-smartphone class devices.
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