Crank: High Voltage, Chev Chelios' External Heart Battery Pack (silver, water damaged)

original movie prop

This is two of the three silver-style artificial heart batteries made for Jason Statham's character Chev Chelios. This is the style he gets from the ambulance and includes a Velcro belt. They are functional 'batteries' in that they have several LEDs installed that can be turned on in any combination by a series of switches on the back of the unit. These two batteries were used in these scene where Chelios is dragged through the water behind a boat. You can see the water stains on the front of both of them, they both have evidence of being wet on the inside, and one of them is labeled 'Water' on the back. The case is made from a portable USB Hard Drive case that's been gutted and has the LEDs installed. Runs on two button-cell type batteries.
Here's some screen caps from the scene where he's being dragged through the water. The thugs taped up the battery, because they didn't want him dead yet (but obviously this leaked during filming…).