Crank: High Voltage, Chev Chelios' External Heart Battery Pack (yellow, working)

original movie prop

This is two of the three 'yellow' Chev Chelios (Jason Statham) hero working artificial heart batteries (the top two pictures are the same prop, the third picture is of the other one). These are the yellow-case version he's seen with first as he escapes from the hospital. They are both functional 'batteries' in that they have several LEDs installed that can be turned on in any combination by a series of switches on the inside, which would simulate the battery charge indicator. There was a third battery of this style made, but that one was smashed up for a scene where the battery gets destroyed (it is also listed here on YourProps).
Here's a couple of screen shots showing these two batteries in the movie. The second one is just after he 'recharges' it in a car, and you can see that 3 of the 4 green LEDs are lit (just prior to this shot it only had the red LED lit). (The green lights would go off one by one, and after the forth goes off, the red one comes on, and he needs to get more power quickly, thus the ridiculous (but fun) premise of the movie...)