Excessive power draw

[kapitan-u]

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

[erdebee]

Talking about ~20 nA, how is that excessive?

[dl9sec]

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...