[aprssig] [atgp] How much power required for a backpack tracker?

Jason Winningham kg4wsv at gmail.com
Fri Oct 8 17:33:41 EDT 2021

> On Sep 29, 2021, at 2:52 PM, Robert Bruninga <bruninga at usna.edu> wrote:
> For a 550 mAh 9V battery, the life would be about
> ten days.  

I doubt it.  9v “transistor” batteries are designed for very low current loads, and if you manage to suck 600mA out of it (you won’t) you will seriously shorten the service life.

If you want 9V, use three CR123As.

Or just use lithium AAs. less mass and more energy density vs. alkaline AAs (or any other common chemistry for that matter).


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