external battery charger

[John Weir]

Need to understand them. Been looking at Anker batteries.  Do they self 
regulate their output? ie  I have a device that charges off the plug in 
power supply at 550ma.  IF I use an external battery charger that can 
supply 1 or 2 amps , is this spec the possbile peak rate while the 
battery charger only provides 555ma to my device then if I have an 
iphone needing 1 amp it provides one amp?  Ie I dont want to over heat 
and to blow up a iphone or other device small battery that usually 
charges at 550ma by hitting it with 1 or 2 amps..    How do they work?  
John Weir

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