[aprssig] balloon tracker
scott at opentrac.org
Wed Mar 2 13:22:28 CST 2005
> them - a 2.4 Ah, 3.6 V 'AA' cell is around $6 - about what the CR123A
> me at Wal-Mart. Weight is 17.6g, vs. 16.8g for the 1.5 Ah, 3 V CR123A.
> 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
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