Electronics > Projects, Designs, and Technical Stuff
Looking to (re)build a circuit to discharge my lipo batteries to like 3.9-3.7
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magic:
I don't think relays can be expected to have well defined turn-off voltage which will be repeatable and stable over long time. These are mechanical devices with springs, pivots and all sorts of unreliable stuff.

I would first try the TL431 circuit described above, simply because I suspect that this is how those things that you posted work. But test it first. Or test it on a lab PSU, that would be quite trivial.
SiliconWizard:
A relay... that would be absolutely not accurate, not by a long shot. The added fun would be that it would probably get into an oscillating state when the voltage gets close to the min operating coil voltage... furious clicking... Fun stuff. :-DD
tunk:
Would an LED in series with a resistor and one or two diodes work?
gilligan:

--- Quote from: tunk on December 29, 2019, 11:26:45 pm ---Would an LED in series with a resistor and one or two diodes work?

--- End quote ---

The original has an LED and a fat resistor.
not1xor1:

--- Quote from: magic on December 29, 2019, 10:44:02 am ---A single transistor could perhaps replace the TL431 if you can live with a few % of discharge voltage variation over typical room temperature range. Also, a low voltage TL431 variant like TLV431 or many others could be useful.

--- End quote ---

TL431 is the cheapest and unlike other chips withstand up to 100mA of current


--- Quote ---TL431 output saturates down to 2.5V,

--- End quote ---

saturation voltage should be a little less than 2V
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