Most phones still depend at least partly on cellular to get a GPS position, and that uses up a lot of battery. Passive GPS tracking uses a bit less power than an active GPS map, but it still wears the battery down. Bin Chen, I doubt any dynamo charger solution could keep up if you have power-hungry apps running, and I highly doubt any could do it while also powering a light.
The Luxos U is the least expensive solution, since it includes both light and USB charger. But it may not have the throughput of a separate charger/light combo, especially one wired with a switch to cut out the light during the day. The Luxos U can trickle charge a phone with the lamp turned off. My Luxos U can top my iPhone 6 off from 20% to full in about 40-50 miles, if the phone isn't running any apps or music. If Strava is running, it takes twice as long (or is half as effective). If I have the phone on my handlebars with Strava pulled up, the Luxos U keeps battery status quo but doesn't gain any charge. your amperage may vary On Thu, Nov 30, 2017 at 7:06 AM, Jeff Lesperance <jeff.lespera...@gmail.com> wrote: > I'm not sure what you consider the cutoff for modern day iphone vs. older > iphone. I've been using a Sinewave Cycles Revolution ( > https://www.sinewavecycles.com/products/sinewave-revolution) to charge a > few recent iPhone versions, 4s - 6s, without a problem. > > If I'm using my phone for GPS, keeping the screen on and phone active near > 100% of the time, and I want to run my headlight at the same time, I need > to be going at a consistent upbeat pace to keep pace with the battery drain > rate - in the semi-urban and lumpy area that I live, this can be a > challenge and all I end up doing is slowing the drain rate. If I keep my > headlight off, no problem charging the phone at all, or, if I run my > headlight but don't have anything intensive running it's also not usually a > problem to charge the phone vs. just staying even with battery drain rate. > > When I've been out on tour, I do tend to charge a battery pack at some > point during the day vs. charging the phone, and then just use the battery > pack as needed to top up the phone. > > -Jeff > Silver Spring, MD > > On Wed, Nov 29, 2017 at 11:30 PM, Bin Chen <bin.c...@gmail.com> wrote: > >> Anyone have a reliable solution for actually powering a modern day >> iPhone? Seems all the stuff out there works for older iPhones at best? Or I >> need to buy an interim pack that will change it to DC current. Not sure if >> technology has caught up or I just need to suck it up and get what’s out >> there. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "RBW Owners Bunch" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to rbw-owners-bunch+unsubscr...@googlegroups.com. >> To post to this group, send email to rbw-owners-bunch@googlegroups.com. >> Visit this group at https://groups.google.com/group/rbw-owners-bunch. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to the Google Groups > "RBW Owners Bunch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to rbw-owners-bunch+unsubscr...@googlegroups.com. > To post to this group, send email to rbw-owners-bunch@googlegroups.com. > Visit this group at https://groups.google.com/group/rbw-owners-bunch. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at https://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
