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I have spent all day monitoring the voltage drop on 4 AA NiMH connected to the 5v cooling fan. I manually logged the voltage at 15 minute intervals and created a chart from a spreadsheet. The chart speaks for itself....
For the first 30 minutes it goes like the clappers until the voltage stabilises at around 5v, then after 5 hours it starts to die, but I doubt I'd be still sitting on a stool with this 8" Dob observing after that period anyway.
I would assume this would change once it has the mirror mounted close to it, as the change in airflow can alter the load on the fan. But it was a good experiment to do.
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