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How to calculate battery life for specific application

How to calculate battery life for specific application

How to calculate battery life for specific application


I'm trying to calculate the service life for my battery powered application.

Here's how I calculate it. Please le me know if this the right way to do this.

I'm using 3X1.5 Volts AA type alkaline batteries -put in series- (energizer titanium e2) rated at "3135mAh (down to 0.8 volts)". My application works at 4.5 volts down to 2.6 volts.

So to get the total energy from the battery I multiplied 4.5V by 3135mA by 3600 (sec) which gives about 50787 joules.

I then took the total battery energy and divided it by my application's average power consumption per day at 4.5 volts, that is about 16 joules. So 50787/16.06 = 8.6 years !!

Now I know that theorically, 8.6 years is real long for 3XAA type alkaline batteries. I would surely need to caculate the energy derating over the years.

Nevertheless, I need about 4 years of battery life. Assuming the application is used at 23 degC ambient, will this do it ?

May I use the manufacturer rated energy this way ? Thanks for helping me. I'm no battery experts and my caculation results seem a bit unerealistic to me.


RE: How to calculate battery life for specific application

cross posted at Thread248-105124


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