Wednesday 19 June 2019

power - Bench Supply Amps - 4AA Batteries



I have a battery powered device that runs from 4 AA batteries. Whilst testing, I am wanting to power it from an adjustable bench power supply.


How can I work out what amperage to set my bench supply at? Do AA batteries have a standard amp rating? There is nothing mentioned on the battery itself.



Answer




I found this note on size AA batteries at this website blog. It is a large blog that clears the air about amps vs. amp/hour ratings. Based on this blog I would limit current to 500 mA. Though a Alkaline battery might be rated for 2000 to 3000 mAh, that could be a overload value and not the nominal current drain expected by the battery manufacture.


Speaking in general terms, you could expect the battery to run for about 10 hours at 10% of its mAh rating, but not all battery types follow such a drain curve, and not all loads react to a low battery the same way. Please read the blog.



Pololu Blog » Engage Your Brain » Understanding battery capacity: Ah is not A Posted by Jan on 12 November 2010


AA batteries. A typical alkaline or NiMH battery in the standard “AA” size has about 2000 to 3000 mAh (or 2 to 3 Ah). With a cell voltage of 1.2 V to 1.5V, this corresponds to 2 to 4 Wh per cell.



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