Hello,
I've got a bunch of 18650 3.7V li-ion batteries lying around, that I would like to use for connected sensors.
These batteries are fully charged at 4.2V, and I have a nice charger for them. The issue I have is that I need to make sure they do not discharge further than 3V. For that I designed a simple comparator that would cut down the power when the batteries reach 3V.
Here is the circuit I came up with
It is working great, the voltage divider divides the battery voltage by a factor of 10, then I can setup the threshold voltage with the potentiometer.
My problem is that when I put a charge on the connector, the current is not sufficient and my sensor does not start. (voltage drops to ~1.2V).
I'm quite unsure of what my issue could be, would you help me out?
Cheers,
Benoit
I've got a bunch of 18650 3.7V li-ion batteries lying around, that I would like to use for connected sensors.
These batteries are fully charged at 4.2V, and I have a nice charger for them. The issue I have is that I need to make sure they do not discharge further than 3V. For that I designed a simple comparator that would cut down the power when the batteries reach 3V.
Here is the circuit I came up with
It is working great, the voltage divider divides the battery voltage by a factor of 10, then I can setup the threshold voltage with the potentiometer.
My problem is that when I put a charge on the connector, the current is not sufficient and my sensor does not start. (voltage drops to ~1.2V).
I'm quite unsure of what my issue could be, would you help me out?
Cheers,
Benoit