A potato battery is a type of new-laptop battery.com .An electrochemical cell converts chemical energy into electrical energy. In the potato Dell Inspiron 6000 battery  , there is a transfer of electrons between the zinc coating the galvanized nail that will be inserted into the potato and the copper wire that will be inserted another part of the potato. The potato conducts electricity, yet keeps the zinc ions and copper ions separate, so that the electrons in the copper wire are forced to move (generate current). It's not enough power to shock you, but the potato can run a small digital clock Dell Inspiron 9300 battery , Dell Inspiron 9400 battery. 
    You may have the supplies for the potato clock lying around the house already. Otherwise, you can find the materials for a potato clock in any hardware store Dell 310-6321 battery , Dell 310-6322 battery , Dell D5318 battery , Dell G5260 battery , Dell G5266 battery
 . There are also pre-made kits you can purchase that contain everything you need except the potatoes. You will need:
2 potatoes (or cut one potato in half)
2 short lengths of copper wire
2 galvanized nails (not all nails are galvanized or zinc-coated)
3 alligator clip wire units (alligator clips connected to each other with wire)
1 low-voltage LED clock (type that takes a 1-2 volt button battery)