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Originally Posted by sanddrag
Sometimes you really have to question what professionals tell you if it just doesn't seem right. The battery life probably would not be sufficient for a wheelchair but most definitely would be for an average FIRST robot. Also, the battery is rated as 18 Amp-Hours capacity, not 18 amps supply. Roughly roughly speaking, it means you can continuously pull one amp for 18 hours or 18 amps for one hour, etc. You should look at the spec sheet http://www2.usfirst.org/2005comp/Specs/batex.pdf for a more specific answer. |
Its much more closer to 1 amp for 18 hours. If you look at the specsheet you linked, the 18AH of capacity is rated for a 20 hour discharge. According to the specsheet, for an 18A discharge, you only get about half that capacity.
Interestingly enough, I've been running some tests on a fixed 1.2 ohm resistor (so approximitally a 10A discharge rate, average), and getting about 85-90 mins of run-time before the circuit automatically shuts off and re-charges at 10V. The spec-sheet only shows about the same time (maybe even a little less), so I'd say those numbers are pretty good (or atleast the 10A discharge rate #). I haven't bothered with lower discharge rates, and I need some bettter cooling for my resistor before I can go to greater discharge rates.