18650 lion battery charge control

252

04:14:41

3.7v lion battery
for 12v and 9v

published 2 years ago

592azy2circuitdude

2 years ago

Hi. Please, I would like to point out a few things from my knowledge of Li-ion chargers. First, this doesn't seem to be a constant current constant voltage charger (CC-CV). If the current is not limited to 1C of the battery, it may be damaged. Second, after reaching the cutoff point of 4.2V, there is still a small current flowing into the battery (~1mA). This may not be as big a problem as the first, but still, I noticed it.

592azy2circuitdude

2 years ago

What I'm trying to say is that your circuit will work (I think) in real life, but you need to be careful with it. What are your thoughts?

skynet2036

2 years ago

you are right but l couldnt do any circuit to limit current. do you have suggestion?

592azy2circuitdude

2 years ago

Unfortunately, most of my experience is with dedicated Li-ion battery charger ICs like BQ21040 and MCP73831! But after some work, I think I improved it with a current limiter. https://everycircuit.com/circuit/6717920000081920. Don't know how well it works practically, though.

skynet2036

2 years ago

l will try it thank you

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