Archived posting to the Leica Users Group, 2017/05/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]The LifePower unit I got is not cheap or light but it will charge my SL batteries on 3 hours of solar charging. This trip will be a trial. If it doesn't work or the airline takes it away from me, I will be using my cell phone which I can charge with a solar battery. Tina Sent from my iPhone > On May 19, 2017, at 8:27 PM, Spencer Cheng <spencer at aotera.org> wrote: > > USB 3.1 power sources can deliver 12V and 20V. Other than plugin power > supplies (i.e. the MacBook Pro PSU), I am not aware of portable USB > battery banks that can deliver 12V. It would require different electronics > (builtin power supply management silicon to do voltage conversion) or some > other way of wiring compared to standard USB battery banks. > > In any case, those are not likely to be very portable nor cheap. > > Regards, > Spencer > >> On May 18, 2017, at 22:11, Jim Nichols <jhnichols at lighttube.net> wrote: >> >> Aram, the problem may be voltage, not size. I think the SL battery is >> 8.4 volts, so the supply voltage source would have to be higher, if my >> old EE recollections are correct. The iPhone batteries are only 3.8 >> volts. USB charging voltage is 5.0 volts, hence the SL can't charge from >> those, but many smaller devices can. >> >> Jim Nichols >> Tullahoma, TN USA >> > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information