Hi, I'm entering this thread late, but maybe you'd want to consider a Charge Bank which is available at www.ATGuys.com.
It can charge several devices at once and can fully charge an iPhone 5S at least twice. They get $89 for it. John S ----- Original Message ----- From: "John Weir" <johnw...@gvtc.com> To: <macvisionaries@googlegroups.com> Sent: Sunday, September 6, 2015 15:03 Subject: Re: external battery charger > Aman: in the 500ma case below, on the USB there is no handshake on the > data lines, the device has only 5 and ground, does that matter? it was > designed to use a 120v ac charger with 5 volts 500ma DC output. I am > wanting to extend life from 5 hours to about 15 with out recharge so > connecting to external battery. Will the Anker or any other such > battery need some sort of feed back? John > > On 9/6/15 8:19 AM, Aman Singer wrote: >> 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 <johnw...@gvtc.com> 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 >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "MacVisionaries" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to macvisionaries+unsubscr...@googlegroups.com. >>> To post to this group, send email to macvisionaries@googlegroups.com. >>> Visit this group at http://groups.google.com/group/macvisionaries. >>> For more options, visit https://groups.google.com/d/optout. > > -- > You received this message because you are subscribed to the Google Groups > "MacVisionaries" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to macvisionaries+unsubscr...@googlegroups.com. > To post to this group, send email to macvisionaries@googlegroups.com. > Visit this group at http://groups.google.com/group/macvisionaries. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "MacVisionaries" group. To unsubscribe from this group and stop receiving emails from it, send an email to macvisionaries+unsubscr...@googlegroups.com. To post to this group, send email to macvisionaries@googlegroups.com. Visit this group at http://groups.google.com/group/macvisionaries. For more options, visit https://groups.google.com/d/optout.
