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How is charge level measured on CR2032 lithium battery?
The Silicon Labs reference firmware for these modules has less-than-spectacular charge level measurement, and I seek to improve it. Two aspects of CR2032 lithium battery discharge performance need to be understood. Firstly, the voltage does not change very much over the first 75% of the discharge.
What kind of voltage does Panasonic CR2032 battery have?
Long-term discharge has been verified at all operating temperatures under low-load discharge conditions. The Panasonic lithium coin CR2032 battery has a high voltage of 3V.
What kind of IoT device uses CR2032?
Typically a device that uses a CR2032 is a low duty-cycle device; a very low power device that spends most of its life asleep. It then wakes up for short periods, fulfills its purpose in life, and goes back to sleep. This is especially the case for BLE IoT peripherals.
What should the discharge current be on a battery?
In general you might expect this number to be something like 1/5 or 1/10 of the C rate, meaning a 5 hour or 10 hour time to fully discharge. Maximum continuous discharge current sounds like what is the maximum drain current that will remain safe on the battery without “abusing” it and thereby shortening battery life.
Standard discharge current is related with nominal/rated battery capacity (for example 2500mAh), and cycle count. If battery is discharged with higher current – real available capacity will be smaller (it may be much smaller). Discharging battery with lower current will extend real available capacity a little bit.
What’s the difference between a BR and CR battery?
Characteristically, CR type batteries begin with a slightly higher voltage than BR during discharge. However, as a CR cell discharges, the operating voltage drops over time because of the rise in internal impedance. CR type batteries are slightly less robust than the BR type when exposed to temperatures at the high end of the operating temperature