Archived posting to the Leica Users Group, 2017/05/19

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Subject: [Leica] Portable Power Supply
From: spencer at aotera.org (Spencer Cheng)
Date: Fri, 19 May 2017 20:27:12 -0400
References: <CAH1UNJ127eaC_PZeOO_ro_CHjoWtpa5YpgbzJnm6KH5p4gS3Ug@mail.gmail.com> <DM3PR10MB0924E3A589299672585C0439B8E50@DM3PR10MB0924.namprd10.prod.outlook.com> <d32eb4d7-073f-cb87-6377-6d646df9af6a@lighttube.net>
 
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
>
Replies: Reply from tmanley at gmail.com (Tina Manley) ([Leica] Portable Power Supply)
 In reply to: Message from jayanand at gmail.com (Jayanand Govindaraj) ([Leica] Portable Power Supply)
Message from leica_r8 at hotmail.com (Aram) ([Leica] Portable Power Supply)
Message from jhnichols at lighttube.net (Jim Nichols) ([Leica] Portable Power Supply)