Monday, January 18, 2010

Hand Grenade vs. Droid

A friend recently said something along the lines of "modern phone batteries pack about the same power as a hand grenade."

I did some quick math... 3.7volts * 1400 milliamphours = 18648 joules. A handgrenade is about 700,000 joules. So... not even close.

Now my laptop battery has 7200 mAh @ 7.2 V... almost 100K joules. Now we're getting in the ballpark.


2 comments:

Anonymous said...

There's a difference between the energy released when you discharge a battery normally down to its safe discharge level, and when it shorts and melts down into slag....

Trimbo said...

This is purely an exercise in joules stored, not explosive force, if that wasn't clear.