I'm making a very power-critical project(a wristwatch) and I want to get the most battery life from the smallest battery.
I have an Espruino Pico, two 16 segment LED displays, 4 SMD leds(2 on the pico 2 on the pcb), 5 tactile switches, and 220 ohm resistors for every LED, including those on the 7-segment display.
I've roughly estimated the total power requirement to be about 100mah. However, other similar diy watch kits I've seen on the web like https://www.sparkfun.com/products/11734 gets a full TWO YEARS from a single coin cell! Am I doing something wrong? I too would like to get several years of power from a coin cell.