Hi, 
The amperage of output noted on a USB five volt battery indicates the peak 
output if the device requests it. These batteries can charge any usb powered 
device using standard protocols, keep in mind that some devices use only a 
hundred miliamps  and others use three amps. The usb specification, even on 
computers and wall chargers, needs to handle such differences between devices 
gracefully.  
Hth,
Aman 


> On Sep 5, 2015, at 11:11 PM, John Weir <[email protected]> wrote:
> 
> 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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