Can I Use 5w Charger For Iphone 12. For fast charging iPhone 12 and later models require a power adapter with a minimum power output of 20 watts such as the Apple 20W USB power adapterIf you use a third-party power adapter it should meet these recommended specifications. Both will work with an old USBa - lightning cable to charge iPhone 12.
However the 5W charger from the iPhone will not charge your iPad as it does not provide enough power to. Assuming the iPhone 12 has a similar battery size as iPhone 11 and adopts the same fast charging technology the 20W fast charger will be able to charge up to 50 in 30 minutes and up to 100 in 2 hours and 8 minutes or so. Higher wattage adapters at or above 9V256A will also deliver a maximum of up to 15W peak power to your iPhone When Lightning accessories such as headphones are connected charging is limited to 75W to comply with regulatory standards.
But of course the phone cant charge at a faster rate than the charger supplies so a phone capable of fast charging will charge faster using a charger with capacity over 5W.
Look at the compatibility list below. IOS 13 will have better charging profiles for those that plug the phone in every night. By using a much stronger charging port 29 watts and a USB-C lightning cable you can charge an iPad faster. The bigger 13 pro models have much bigger batteries than the iPhone 4 which that 5 watt charger was initially designed for but that little charger will work.
