For powered, untethered devices, an interesting design threshold is the lifespan of the rechargeable battery required to power it.
Type 1 devices are worth designing to outlast their batteries
Type 2 devices are not
In the future almost everything will be Type 2
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What’s more. Type 1s will mostly have at least 3x lifespan of their batteries. Barbell: lots of 3x+ and 1x devices, very few in between
Also, devices that last < 0.5x the battery they need... the new disposables
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