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

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Subject: [Leica] Portable Power Supply
From: tmanley at gmail.com (Tina Manley)
Date: Fri, 19 May 2017 20:47:43 -0400
References: <CAH1UNJ127eaC_PZeOO_ro_CHjoWtpa5YpgbzJnm6KH5p4gS3Ug@mail.gmail.com> <DM3PR10MB0924E3A589299672585C0439B8E50@DM3PR10MB0924.namprd10.prod.outlook.com> <d32eb4d7-073f-cb87-6377-6d646df9af6a@lighttube.net> <007497A7-1529-4403-A65F-D95F3B9979EE@aotera.org>

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
>> 
> 
> 
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Replies: Reply from spencer at aotera.org (Spencer Cheng) ([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)
Message from spencer at aotera.org (Spencer Cheng) ([Leica] Portable Power Supply)