Say I have a device that consumes around 20uA working with four Li-FeS2 AAA 1.5V batteries in series, delivering a total of 6V between them. According to Wikipedia, those batteries can deliver an average of 1,200 mAh. And according to Newark's website, a battery's life can be calculated with the simple formula:
The above calculation is done for a single battery with a capacity of mAh. And I would understand that if I were to connect several batteries in parallel, they would deliver the same voltage but their mAh capacity would add up. Is that right?
But if I were to arrange them in series, their voltages add up, but the mAh capacity remains the same as if it were a single battery. Is that right?
So, for my arrangement, my batteries expected lifetime would be 0.7 * 1,200 / 0.020 = 42,000 hours = 4.8 years. Are my calculations correct?
And my last question would be: My intuition tells me that connecting batteries in parallel might discharge them prematurely due to small differences in voltages between them, but this is a problem that would not be present when connecting them in series, right?
estimated hours = 0.7*mAh/mA
The above calculation is done for a single battery with a capacity of mAh. And I would understand that if I were to connect several batteries in parallel, they would deliver the same voltage but their mAh capacity would add up. Is that right?
But if I were to arrange them in series, their voltages add up, but the mAh capacity remains the same as if it were a single battery. Is that right?
So, for my arrangement, my batteries expected lifetime would be 0.7 * 1,200 / 0.020 = 42,000 hours = 4.8 years. Are my calculations correct?
And my last question would be: My intuition tells me that connecting batteries in parallel might discharge them prematurely due to small differences in voltages between them, but this is a problem that would not be present when connecting them in series, right?
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