You can negotiate charging with essentially a single resistor. Deciding when to stop / balancing cells etc is the harder problem.

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IshKebab 17 hours ago | parent | next [-]

> You can negotiate charging with essentially a single resistor.

For USB sure.... I'm pretty sure this doesn't charge over USB.

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0_____0 16 hours ago | parent [-]

I'm surprised, and you'll be surprised, but this is true!! I gotta start actually looking shit up before saying something....

https://en.wikipedia.org/wiki/SAE_J1772#Signaling

	▲	labcomputer 11 hours ago \| parent [-]
		J1772 is significantly more than a single resistor. And, while the signaling is analog, all practical implementations are going to use digital circuitry to generate and detect it.

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Onavo 17 hours ago | parent | prev [-]

Well, OP Amps are technically "analog" too.

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kragen 5 hours ago | parent | next [-]

Op-amps are absolutely, 100% analog in every sense; there's no need to limit this assertion with the nonstandard adverb "technically". The term "analog" was invented in the first place specifically to describe circuits made out of op-amps rather than "digital" circuits. And, yes, you can totally balance the charge on your cells using op-amps and similar analog circuits. You will probably want some sharp PWM waveforms in the circuit, but PWM isn't all the way to digital.

	▲	jesperwe 2 hours ago \| parent [-]
		I would question whether a PWM "technically" counts as digital... It is on and off, sure, but so is a mechanical power switch, which few would describe as digital. "Digital" is more when we get higher level values represented by multiple signals that are on or off (aka bits).

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fragmede 17 hours ago | parent | prev [-]

Well, they could be using vacuum tubes…