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How to use batteries in a Series-Parallel Combination? Answered

   Is it possible to use 4 AAA Duracell batteries instead of 2 AA batteries if I were to put it in some form of Series/Parallel combination? Would it keep the same voltage and stuff to not interfere with the electronics of something but just increase the time between changing batteries? What would the layout look like for this?

Thanks Instructablers!

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gruffalo child (author)2010-10-10

In theory you certainly can, but if any two batteries are not exactly identical, they will start to charge one another, heat up, etc... I think it is not worth it. I would go and buy 2 AA ones.

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seandogue (author)2010-10-10

Sure, place 2 AAA batteries in parallel twice, then connect the two group is series.

That just means connecting two batteries + to + and - to -, then doing the same for the other two, and then treat the new "batteries" as if they were single batteries.

For instance, a 12V automobile battery is just six 2V battery cells in series. If you then connect a second automobile battery in parallel with the first, you have a similar situation to the one you want to achieve.

In other words, you can either take a pair of AAA batteries already connected in series and apply then in parallel with another pair connected in series or th way I suggested in the second sentence.

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rickharris (author)2010-10-10
Yes - your battery pack has 2 main properties - A voltage and a current capability.

The voltages is based on the fact that a standard alkaline cell will give 1.5 volts at it's terminals so 2 in series gives 3 volts - 1.5+1.5

The current rating differs from type of battery to type of battery and should be written on the case in milli amp hours. batteries in parallel will provide up to the 2 current capability added together.

So you can put 2 AA cells in series to get the voltage you want with another 2 in parallel to increase the current available.

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steveastrouk (author)2010-10-10

If they are all brand new, same type, same make, yes, two+two will work, and increase the capacity of the system by 2.

Steve

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