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I'm a newbie, I need to know how to calculate the current consumption of circuit and also how do calculation of the battery life according to the circuit's current consumption? I'm using Li-Po battery ( 400mAH , 3.7 V, 1.48 WH). Thank you for your help in advance.

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marked as duplicate by PeterJ, brhans, Rev1.0, JIm Dearden, Scott Seidman Jun 19 '15 at 17:07

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    \$\begingroup\$ What's the load? \$\endgroup\$ – user76920 Jun 10 '15 at 9:44
  • \$\begingroup\$ What is the lowest voltage that the LiPo can drop down to before the circuit no longer works reliably? \$\endgroup\$ – Andy aka Jun 10 '15 at 9:46
  • \$\begingroup\$ you can refer this [How to calculate battery life][1] [1]: electronics.stackexchange.com/questions/1478/… \$\endgroup\$ – Sanjeev Kumar Jun 10 '15 at 10:58
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This is a bit difficult because the voltage across the load is probably going to change as the battery wears out. The simplest case is as follows; if you know the current to the load (given in Amps), and you know that your battery is 400mAH, then by simple integration, you can figure battery life by the following calculation.

enter image description here

Now, to expand on this logic, if you can plot current over the usable lifetime of the battery, you will be able to get a more fin grained picture of the estimated battery life.

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