The Battery

The Battery is a passive item.

Effects

 * Active items can store an extra level of charge, allowing them to be used twice in one room.
 * Extra charges appear in yellow over the normal charge meter.

Synergies

 * 48 Hour Energy! Pill: A fully discharged item will be doubly charged, along with spawning 1 or 2 Lil' Battery pickups.

Trivia

 * This item is used in It's in the Cards (challenge #14).
 * The screws that appear in Isaac's head may be a reference to Frankenstein's Monster.