How Volts, Amps and Watts Charge Batteries
So how do all these things work together to power your device? Wattage is the overall measurement of power that flows through your charger, so a higher cell phone charger wattage means that your device will charge faster. If you're shopping for a new charger and the wattage isn't listed, you can also calculate it with the formula: watts = volts x amps. For the quickest charge, pick the device that offers the highest wattage.
One of the most common questions about phone charger wattage is "how many amps does an iPhone need to charge?". Some devices, like the iPhone, have a built-in mechanism that only lets them draw one amp of current, even if your charger can offer more. However, you can still buy a charger with higher amps – it won't hurt your cell phone battery.
It's not just cell phones and small devices that rely on chargers – you can also use your knowledge of volts, amps and watts when shopping for car and truck batteries and other common appliances. If you're not sure whether your device has a limitation on the type of charger that can be used, check with your manufacturer or drop by your local Batteries Plus Bulbs location and one of our experts will be happy to help you find the perfect cell phone charger, car and truck charger and more.