Tracker brownout protection

Tracking System
1

Hi,
What are the dangers of mistakenly letting a Tracker One run on its internal battery until the battery dies, without any external power source?
Is the Tracker One running Tracker Edge firmware protected from a brownout or any other dangers from this (unwanted) situation?

Thanks,
Gustavo.

EDIT: @eberseth or @rickkas7 may you have any thoughts on this? Thanks

2

I would probably avoid doing that. The nRF52840 won’t be damaged, but you do risk damaging the cellular modem if the device shuts off while trying to connect to cellular because of insufficient battery power.

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3

Thank you.
What would you set as the minimum level/SoC of the battery: 10%, 20%, 15%?
Thanks again.

4

That’s a tricky question. If you stay connected to cellular, you can probably go lower because connecting it what causes problems, especially on 2G/3G, less so on LTE Cat M1.

The next problem is that the SoC is not linear. You’ll find there’s a very long tail where the SoC is less than 1% and the device continues to run, for many hours running constantly in normal operating mode, at least with LTE Cat M1.

I’m just throwing out random-ish numbers here, but I would probably go with 5% for LTE Cat M1 and 10% for LTE Cat 1/3G/2G.

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