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Old July 29, 2009, 01:23 AM
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MpG MpG is offline
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If you try a 9V, keep an eye on it at first. Dry-cell batteries have notable internal resistance that can make bad things start to happen at higher current levels. Hopefully, a single computer fan (~0.15-0.4A) wouldn't be enough to be a problem, but it's possible that you could see the battery begin to warm up over time. This is one time where running multiple batteries in parallel could be quite useful to reduce the current load on each cell.
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