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I need to wire up a battery pack using 1.5V AA cells in the form of a parallel-series configuration to achieve 4.5V and 9Ah (assuming a single cell gives 3Ah). The first configuration in the image is one way I've seen it recommended online: 3 cells in series to give 4.5V and 3Ah, then 3 of those in parallel to give 4.5V and 9Ah.

I'm wondering if the second diagram in the image also works? Start with 3 cells in parallel to give 1.5V and 9Ah, then wire 3 of those in series to give 4.5V and 9Ah? Is this correct? What's the advantages/disadvantages between the two options (assuming the 2nd works)? Two configurations

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  • \$\begingroup\$ Same same thing thing ....there are no differences unless you want to consider potential failure modes of a cell (open circuit or short circuit) ...then it matters \$\endgroup\$ Commented Dec 21, 2017 at 23:35
  • \$\begingroup\$ 3Wh maybe ? en.wikipedia.org/wiki/AA_battery#Comparison \$\endgroup\$ Commented Dec 22, 2017 at 0:21
  • \$\begingroup\$ I don't know how your comment and link are related. Please explain @TonyStewart.EEsince'75 \$\endgroup\$ Commented Dec 22, 2017 at 4:06
  • \$\begingroup\$ electronics.stackexchange.com/questions/346255/… \$\endgroup\$ Commented Dec 22, 2017 at 9:59
  • \$\begingroup\$ Jack your value for Ah per cell is far too high considering to final voltage used for 0% SoC will not be valid without matching the same v vs I specs \$\endgroup\$ Commented Dec 22, 2017 at 22:29

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The second allows for balancing in each set of three. The first does not allow for any balancing and is more likely to cause problems with poor batteries stopping the power output prematurely. Theoretically they are the same though. See this answer

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