All you need is a few inches of of flexible tubing and a velcro strap.
Step 1: Attach Tubing to Wire
It should be about 8 inches from the charger for strain relief.
Step 2: Wrap the Cord
Close your fingers and slide the wrapped cord off your hand.
Step 3: Neat and Safe
Bend the tube and press it over the charger prongs.
The tubing will keep your gear safe from the charger prongs.