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Published 20 hours ago • verified publisher icon LilyGO

Excessive power draw

Open kapitan-u opened this issue 4 years ago • 2 comments

100k/100k divider for measuring battery power is causing excessive power draw. please consider P-FET solution described here https://fettricks.blogspot.com/2014/01/reducing-voltage-divider-load-to-extend.html for future versions

kapitan-u avatar Feb 27 '20 20:02 kapitan-u

Talking about ~20 nA, how is that excessive?

erdebee avatar Oct 15 '20 15:10 erdebee

Lets say 4V/200kR=20µA (not nA), but that is not much either. Far away from being "excessive"... :-)

But I agree, there is neither a overvoltage nor a undervoltage protection for the Li-Ion cell. If the voltage falls under 2,5V the cell could loose capacity and could be damaged irreversible. I used a little external 1S protection circuit...

dl9sec avatar Jul 05 '21 05:07 dl9sec