I found this on Amazon here in the US. 
http://www.amazon.com/gp/product/B00H01VGTQ?redirect=true&ref_=cm_cr_ryp_prd_ttl_sol_0
It has the same DC to DC converter as the cable John Hogerhuis located in the 
UK.The DC to DC converter boosts the 5V output of the "juice pack" to 6V, which 
is what your Tandy AC adapter outputs.
For only $10 it look like a good deal.
The output plug would need to be changed to suit the M100, but the voltage 
should be fine. 6VDCIf you don't solder, these might work for 
you:http://www.amazon.com/Power-Cable-Female-Connector-Camera/dp/B00EK6OAF6/ref=cm_cd_al_qh_dp_t
 
Unfortunately you would need a meter to be sure how to get the polarity correct 
for the M100.
Obviously, If you can solder and have a meter you can find a plug that would be 
more elegant.


Steve Ranft 
Savage, MN

Date: Fri, 27 Nov 2015 22:44:08 -0600
From: [email protected]
To: [email protected]
Subject: Re: [M100] USB "juice pack"

Hi John,
I use a 6v lantern battery in a plastic frame with a power switch and cable 
with the correct barrel connector on it.  I got it while I was living in 
Australia before I moved over to the USA do i don't know what the part number 
is.  I may have even got it at the local tandy store  :-)
Cheers,    Bert


-------- Original message --------
Subject: [M100] USB "juice pack" 
From: "John R. Hogerhuis" <[email protected]> 
To: Model 100 Discussion <[email protected]> 
CC:  


Anyone know what it takes to use the phone charger "juice packs" to run a M100?

Is there an off the shelf connector or converter needed or would I
have to build something myself?

I have a handful of vendor swag cheapie units laying around. Running a
Raspberry Pi off one of them.

-- John.
                                          

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