Power source

A project log for Ultra low power LED

<1.5µA current consumption when continuously on, optional flashing mode

Christoph TackChristoph Tack 05/16/2020 at 18:310 Comments

Coin cell CR2032

These really DO NOT like current spikes.  So a lot of buffer capacitance will be needed to buffer the LED current spike.  Data from Energizer:

Battery life calculations show that the project could run about 1 year when ON-current is 5mA and OFF-current is limited to 1µA.

3V CR123A Lithium cells

store up to 1700mAh.  These will last a lot longer.


If a rechargeable solution is desired, then the 3.7V/120mAh LIR2450 can be used.  This cell tolerates current spikes much better.