The easiest way to make your own Squishy Batteries! This kit contains (10) galvanized nails and (10) copper electrodes. This kit makes a 10-cell battery which should be able to dimly light a red LED bulb when used with our doughs. More cells mean more power! To build a battery, this kit pairs nicely with 1 dough kit (not included). A multimeter and alligator clips are also recommended.