The battery life calculator takes awake time, battery capacity, device consumption, discharge safety, sleep time, battery voltage, sleep mode device wattage and awake device wattage and returns calculated average consumption, device current draw and battery life. It is built for quick answers, for checking somebody else’s arithmetic, and for the moments when a formula book is not within reach.
What Is the Battery Life Calculator?
The battery life calculator turns awake time, battery capacity, device consumption, discharge safety, sleep time, battery voltage, sleep mode device wattage and awake device wattage into calculated average consumption, device current draw and battery life.
It is a quick way to get from the numbers you have to the number you need, without setting up a spreadsheet or reaching for a formula.
How the Battery Life Works
Each result follows from the ones before it, and the calculator shows every step, so a surprising answer can be traced back to the input that caused it.
Round your inputs to the precision you actually know, and keep more precision than that in the intermediate steps.
Getting a Result You Can Trust
Run the calculation twice with slightly different inputs. A sensible calculator moves its output in proportion; a wild change points to a unit or a decimal point problem in what you entered.
Write the inputs down next to the answer. It takes a moment and it is the difference between a number you can explain and one you cannot.
A Worked Example
Working through an example, with awake time set to 10, battery capacity set to 5, device consumption set to 2, the calculator returns battery life of -1,237.5, and device current draw of 0.4, and awake mode of 20. Substitute your own figures and the same steps produce the same kind of answer.
Frequently Asked Questions
What do I need to work out calculated average consumption?
Enter awake time, battery capacity, device consumption, discharge safety, sleep time, battery voltage, sleep mode device wattage and awake device wattage. The calculator then works through the relationship and reports calculated average consumption, device current draw and battery life.
What does the battery life actually calculate?
It takes awake time, battery capacity, device consumption, discharge safety, sleep time, battery voltage, sleep mode device wattage and awake device wattage and converts them into calculated average consumption, device current draw and battery life using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter awake time?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Do I have to fill in every field?
Only the fields a particular result depends on. If you leave one blank, the results that need it simply show a note instead of a number, and everything else still works.
Does anything you type get stored?
No. The whole calculation runs inside your browser, and nothing you enter is uploaded, logged or sent anywhere.