Do you get twice the runtime from twice the amp hours? That's the question our Managing Editor's son, Calvin, decided to tackle for his 5th-grade science fair project and the results are relevant for today's jobsite! .
Conclusion: Do You Get Twice the Runtime From Twice the Amp Hours?
On average, the 4.0 Ah battery does more than twice the work of a 2.0 Ah battery. We did have one test where it did less, though. This supports my hypothesis. .
Editor's (AKA Dad's) Notes
Taking the results of all 5 tests together, the 2.0 Ah battery bored 257 holes. The 4.0 Ah battery bored 544 holes. If the 4.0 Ah battery only did twice the work, it should have drilled a total of 514 holes. As it stands, it does 5.5% more work than the amp hours/watt hours suggest on paper. . .
There's a reason for this. A 12V, 2.0 Ah battery operates on 3 lithium-ion cells. The 4.0 Ah battery has 6. However, they're both producing 12 volts, meaning each member the 6-cell system only needs to deliver half the current (amps) that each member of the 3-cell team does. Since each cell doesn't have to work as hard, it's able to work more than twice as long. .
The same goes for any voltage battery where you have multiple amp hour options. We expect the runtime to do more than match the increase in amp hours in the same applications. You'll also notice similar changes as you move from 18650 cells to 20700 or 21700 cells. The bigger cells work more efficiently on an individual cell level, so they give you more work than you expect on paper. . .
5th Grade Science Fair Results
For my efforts, I won 2nd place in our school Science Fair!
Thank you to @milwaukeetool for providing the 2404-21P M12 Fuel Hammer Drill Kit, batteries, and spade bits. Not only is it a great tool to use, but the fact that it comes in a Milwaukee PackOut box is really cool! . .
Check out the full article at www.protoolreviews.com . .
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