Artifact, 4 (4)
Uncommon (U1)
{2}, {T}: Put a charge counter on Red Mana Battery.
{T}, Remove any number of charge counters from Red Mana Battery: Add {R} to your mana pool, then add an additional {R} to your mana pool for each charge counter removed this way.
Illus. Mark Tedin

10/4/2004: Can be tapped even if it has no counters.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Commander