====== Batteries ======

  * [[https://www.pveducation.org/pvcdrom/battery-characteristics/battery-capacity|Adafruit on Batteries]]
  * [[https://learn.adafruit.com/all-about-batteries/power-capacity-and-power-capability|PV Education on Batteries]] 


  * {{https://biz.maxell.com/en/primary_batteries/CR2032HR_DataSheet_20e.pdf|CR2032 Cell from Maxwell}}
  * [[https://biz.maxell.com/en/primary_batteries/cr_heat-resisting.html|CR type cells, heat resisting, Maxwell]]

Battery capacity $C$ in $mAh$ or $Ah$.

Examples:
  * $C = 1000\mathrm{mAh} = 1\mathrm{Ah}$
  * Nominally: Continuous current of 1A for 1h. But: High discharge currents often lead to a reduced capacity!
  * Better: 10mA for 100h.