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[aprssig] balloon tracker

Scott Miller scott at opentrac.org
Wed Mar 2 19:22:28 UTC 2005


> them - a 2.4 Ah, 3.6 V 'AA' cell is around $6 - about what the CR123A
costs
> me at Wal-Mart.  Weight is 17.6g, vs. 16.8g for the 1.5 Ah, 3 V CR123A.
I'm
> too lazy to calculate it in watt/hours per gram.

Ok, I got bored enough to calculate it.  I get 0.490 watt/hours per gram for
the Tadiran cell, and 0.267 for the Energizer.  Or 1.25 watt/hours per
dollar vs. 0.72, if that's the more critical design factor.  =]

For comparison, gasoline gives you something like 13 watt/hours per gram.
Not counting the weight of the equipment needed to turn it into
electricity...

Scott
N1VG





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