iphone 4 power requirements will old power adapters work

iPhone 4 Power Requirements, will old power adapters work?
location: macrumors.com - date: June 19, 2010
For iPhone 4 will old Power adapters work in charging as well as the one it came with? I am wondering this due to the new battery being added to the iP4 and the iPads battery requirements. The iPad needs a higher power output and can't be charged on some earlier model macbooks, and even the iPhone adapter doesn't charge the iPad well.
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