If I have a system working at 2.5V-0.3mA powered by two CR123 3.7V-2000mAh.
Is my system going to last the same time if I put my batteries in parallel or in series?
Because if I want it to last 12hrs a day during 2 years, at 3.7V (parallel) I need a 1780mAh battery (I have 2*2000=4000mAh) and at 7.4V (series) I need a 880mAh battery(I have 2000mAh).
In both case in parallel and in series it will work.
But in which case is it going to last longer?
Thank you in advance !
Answer
You actually answered your own question in there..... When you have them in parallel, you get 4000mAh, and in series you only get the 2000mAh.
So with that you can see quite clearly that you get more mAh when they are in parallel.
If you wanted to know which one will last longer then you have all the required information right there in your question.....
Just take the mAh you have and divide it by what is required. Whichever comes out with the highest number is the one that will last longer.
4000/1780 = 2.247 2000/880 = 2.27
So there isn't actually that much of a difference in this case.
Pretty sure this is the answer you were after unless I have missed something from the question?
A good place to calculate battery life is HERE
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