Welcome to a Digital Camera Battery specialist of the Apple Ac Adapter
I've got both an iPad and an iPhone that share the same connector, but their power adapters have different wattage ratings. I travel a lot and would prefer not to take multiple adapters along. Can I use the higher-wattage adapter on both devices? Let's start with the official answer: Apple is totally cool with it—the company says so right on the product page for the 10-watt iPad USB power adapter. In fact, Apple lists compatibility with 23 iOS devices dating back to the first-generation iPod Nano. Also, we've tested it—nothing blows up, and the iPad adapter seems to charge the iPhone a bit faster than the stock iPhone charger. So you definitely can charge your iPhone with the iPad charger. The more interesting question, however, is should you. All iOS devices (and most smartphones) charge at 5 volts, the standard for USB devices. The difference between the iPhone and iPad adapters like Apple A1021 Ac Adapter , Apple M4895 Ac Adapter , Apple PowerBook G4 15 inch Ac Adapter , Apple M8943LL/A Ac Adapter , Apple M8482 Ac Adapter , Apple iBook 32 VRAM Ac Adapter , Apple PowerBook G4 12 inch Ac Adapter , Apple PowerBook G4 17 inch Ac Adapter , Apple PowerBook G4 15.2-inch M8859S/A Ac Adapter , Apple PowerBook G4 12.1-inch M9184J/A Ac Adapter , Apple M5937 Ac Adapter , Apple ACD55 Ac Adapter is the rated amperage—the iPad charger is rated to handle 2.1 amps, while the iPhone charger is rated for 1 amp. But the amperage rating is only a measure of the adapter's maximum capability—the actual amperage is determined by the load (i.e., the iPad or iPhone). According to Steve Sandler, founder and chief technical officer of AEi Systems, an electronics analysis company, modern battery-powered electronics have a lot of complexity between the charger and the battery, including battery-charging circuits within the device and battery-protection circuits in the lithium-ion battery itself. These circuits are designed to manage the flow of electricity to the battery, and if the circuits inside the iPhone were designed to tolerate 1 amp, but are routinely exposed to 2 amps, that could stress the system over time. "Even though you may not instantaneously say, 'Wow, I just destroyed my battery!' you may limit its life over the long term," Sandler says, "but you wouldn't know for a year or more." Our advice: Since Apple claims compatibility between the iPad charger and iPhone, pay for the extended two-year warranty for the iPhone to ride out your cell contract, and charge it however you like. If your battery degrades severely after the first year make Apple give you a new one.Same Power Adapter for