Redox codename Ultron pt.10

A project log for Redox keyboard

The Redox project is an open-source, QMK (Quantum Mechanical Keyboard Firmware) powered, ergonomic split mechanical keyboard.

Mattia Dal BenMattia Dal Ben 10/13/2018 at 08:150 Comments

Battery usage update.

In the last two week I used my wireless Redox as my daily driver at work. This means that I use the keyboard 8 hours a day, 40 hours a week and shut it off before going home. It stays powered off during the weekend. I would say that my usage is medium-high since I have a keyboard-centric workflow (I use i3, vim and clion with vim plugin on my workstation), so take this into account.

I measured the battery voltage every weekend and these are the results:

Left hand voltageRight hand voltage

I know I have not enough data but I will try to make a guesstimate anyway.
I would approximate the voltage drop to 0.02 V per week of usage. Looking at the CR2032 datasheet

we can assume a linear discharge down to 2.5 V.

With these data I estimate that a battery could last 25 weeks or 6 months (0.02 V drop per week starting from 3.0 V), in  other words 1000 h of battery life. This is without considering that the MCUs are rated for a minimum 2.0 V operating voltage.

This seems pretty good actually.

Anyway I wouldn't take this estimate as definitive since I have not enough data yet. In the next two weeks I'll keep the battery monitored and report the usage.