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I design a schematic for a alarm device. I use a trigger IC use 40nA and i want to use a 2500 mAh Li-Ion battery. The device is used at outdoor (-20/60 C) at least 2 year.

I want to ask that a fully charged 18650 Li-Ion battery voltage-time graph (how many days the system work) at 40nA usage.


I calculate

40nA = 0,00004 mA

and power consumption is 0,00004 mAh

with 2500 mAh device is used 7000 year. (not believe that :) )

but what is de environment and battery chemistry effect for that calculation?

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    \$\begingroup\$ Look into self-discharge. And that nanoamp current isn't going to be the active current of the device, I'm sure; it probably consumes much more current in brief spikes when it triggers. \$\endgroup\$ – Hearth Oct 22 at 19:26

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