It can make the phone charge faster or it can make the phone charge the battery slower. It all depends on the design and specifications of the charger. In all honestly, most current phones charge within a few hours. If you're going to spend money, might as well just get another battery instead. At least for me, being able to possibly charge my phone in 1.5 hours instead of 2.0 hours would be of no advantage.
The Nexus S charger output is rated at 5V 0.7A, if I'm not mistaken. I've plugged it into an iPad charger several times which is rated at 5V 2.1A and it charged faster, but not significantly so. The device will only take as much current as it needs, so having charger with twice the output will not cut the charging times in half.
I would use the stock charger myself, to reduce the heat like others have said.
Also keep in mind that accessories like chargers and cables typically have over 80% profit margin, so that salesman will tell you anything you want to hear.
Bell 05/2005-08/2006, Virgin Mobile Canada 08/2006-11/2009
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Right, the USB standard is defined such that any power-drawing device will negotiate its maximum safe charging rate. So the Playbook charger, rated at 1.8A, will give a faster charge to any device that is programmed to accept a faster charge - but it shouldn't result in any overload.
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Originally Posted by Colin Nekidboy
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