In one of my Photon projects I use a CR2032 backup battery (non-rechargeable) and I monitor the battery voltage through one of the analog inputs (A5).
After two weeks in operation with Vin connected to 5v for approx. 50% of the time, I noticed that the voltage measured on the backup battery has dropped to about 2,7volts.
- Is this normal behaviour and should I expect that such a huge voltagedrop is only manifest in the beginning of the batteries life???
- Could it be that this is due to the load of the analog input (A5)???
- Or should I have serious doubts on the quality of the CR2032 batteries that I am using???