This little charger brought a dead (measured 2.1V) red Powerwheel battery back to life! (measured 6.5V) This lasted 30 hours. Unlike the charger that comes with the toy (or the optional fast charger), this charger also charges the battery at a very low voltage and then keeps the battery fully charged. destroy) It will automatically turn off (float) by monitoring the battery voltage and only return to charging when required. You can forget about it and leave it plugged in until it's ready to use. It also charges a normally discharged battery much faster than a traditional charger. (3-6 hours vs. 12-18 hours!) It doesn't come with the "A" plug needed to charge the RED Power Wheels battery, so I just used the plug from the original charger cut it off and plugged it into one of the plugs the three connectors. Adapters that I will never use that come with this Schumacher charger. Ideal!