bicycleguy
Senior Member

@Davidelvig For small continuous currents the life is simply the mAh rating of the battery divided by the current. The current is specified as 20uA but I measure 30uA with the 121GW in my application. ...

see this post on VBAT life on T4.1 https://forum.pjrc.com/threads/64216-Beware!-T4x-RTC-power-consumption?p=257979&viewfull=1#post257979

No need to smooth the connection between a battery and a linear regulator for the sake of measuring the level. Even with a switching regulator as I'm using it's not necessary.

So get rid of it !

I have been using a 100k(R1), 22k(R2) bridge with no series R and no C for a number of years on a T3.2 to measure three lithium in series ~12V. In this design the 12V is energized by a FET at the same time as a smps...

As I'm sitting here trying to debug why my RaspberryPIW running the Apache web server is seizing up every few days to a few weeks, it dawned on me that my T4.1 based server running your QNEthernet hasn't crashed in a...