×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

How to calculate battery life for specific application

How to calculate battery life for specific application

How to calculate battery life for specific application

(OP)
Hi,

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.

Thx



RE: How to calculate battery life for specific application

cross posted at Thread248-105124

TTFN

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources