This charger is for use with Power Wheels 12-volt battery systems with one gray battery. A built-in indicator shows the battery charge status so users can easily see when the battery is ready for use. The charger must only be used with a Power Wheels Type 12-volt lead acid battery.
― “We New Englanders have some sense of the reality that battery life can be enhanced by the use, at least on occasion, of overnight chargers,” said Alice Pillivant, owner of Gramps' Garage in Maynard, Mass. Fisher-Price Power Wheels chargers are her second-best-selling item.