For my DSLR camera remote, I was wondering if I couldn’t get it to work because the battery got drained out because my push button repair may have turned out to be a bit too jittery. Good thing I got the one with the replaceable battery.
The first thing I did was measure the battery voltage with a voltmeter when it wasn’t working. 2.9 volts, yeah that’s lower than the earlier times when I measured at 3 volts exactly, but that shouldn’t be too bad, should it? So long as it uses a switch mode power supply. Do these tiny low current electronics use switch mode power supplies, or do they wire up to the battery directly? I searched around for this on the Internet, and after weeding through some StackExchange questions where people clearly didn’t know what they were doing, yeah, it looks like it is plausible that the coin cell electronics may wire up to the batteries directly. Also, the coin cell batteries themselves tend to have a high internal resistance, so it is important that you do not try to draw too much current from them, and also that you avoid continuous current draw. Suffice it to say, it’s safe to assume that coin cell battery electronics are more sensitive to battery voltage changes than AA battery cell electronics. Not to mention that the coin cell batteries themselves have a reputation for outputting a more stable voltage than AA battery cells.
20190907/DuckDuckGo does cmos clock battery use boost circuit
20190907/DuckDuckGo 3 volt button cell battery microcontroller boost
power supply
20190907/DuckDuckGo do coin cell electronics use voltage regulators
20190907/https://electronics.stackexchange.com/questions/261124/coin-cell-regulation-required