---
date: 2024-03-08T17:12:31+00:00
modified: 2024-03-09T09:18:50+00:00
permalink: https://kaspars.net/note/mastodon-social-111991877594288412
post_type: note
author:
  name: Kaspars
  avatar: https://reverse.kaspars.net/gravatar/avatar/92bfcd3a8c3a21a033a6484d32c25a40b113ec6891f674336081513d5c98ef76?s=96&d=mm&r=g
---

# On February 25, 2024 at 11:27

It took 5 days for my Heltec Lora v3 [\#meshtastic](https://mastodon.social/tags/meshtastic) router node to use up 6.6Wh of one 18650 cell at 5% air utilization rate (one telemetry message per minute). That brings it to 6.6W / 5days /24h or 0.055W (15mA@3.7V) on average.

Importantly, this node was also powering a [\#INA219](https://mastodon.social/tags/INA219) sensor which was doing the power measurements every minute.

Now I'll be doing a reference measurement without the INA219 and with zero telemetry.