search

LilyGO / LILYGO-T-Energy

35 stars 6 forks source link

Excessive power draw #2

Open kapitan-u opened 4 years ago

kapitan-u commented 4 years ago

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 commented 3 years ago

Talking about ~20 nA, how is that excessive?

dl9sec commented 3 years ago

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...