Amazon offers Prime members the Power Wheels Toddler 6-Volt Rechargeable Replacement Battery, model no. P6828, for $9.35 with free shipping. (Non-members can spend $25 or more for free shipping; otherwise, shipping adds $5.86.) That's the lowest total price we could find by $24. It is for use with smaller 6-volt Power Wheels toddler vehicles. Note that this battery must only be used with a Power Wheels Toddler 6-volt charger (not included).