John, this stuff shouldn’t matter. The batter is going to provide only what the drain is, not more. You’re playing with I on the E = I * R equation remember. Good ol ohms law.
> On Sep 6, 2015, at 3:03 PM, John Weir <[email protected]> wrote: > > 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 <[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 >>> >>> -- >>> 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 [email protected]. >>> To post to this group, send email to [email protected]. >>> 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 [email protected]. > To post to this group, send email to [email protected]. > 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/macvisionaries. For more options, visit https://groups.google.com/d/optout.
