• It comes down to a simple design decision.

    Do they design the electronics to work with non rechargeable batteries that have a higher voltage and higher capacity or do they take the expensive approach to design to work with both. The cheaper approach that gives the (subjectively) better experience usually wins.

    As mentioned the modules they build the electronics around have a low voltage cutoff meaning that rechargeabke batteries with their lower starting point are able to power them for less time. The fact the batteries can run down to zero isn't the issue...it's that the Dev modules can't. This is particularly pronounced for Dev boards with Bluetooth or WiFi built in.

  • The fact the batteries can run down to zero isn't the issue

    Yeah, I only mentioned that to explain why you won't find lithium-ion chemistries in AA, AAA, etc., batteries.

    Your quora link was great btw. That might be the first time I've seen useful information on that site.

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