From: Dwayne Reid <dwayner@planet.eon.net>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Fri, 14 Feb 2020 10:39:58 -0800
Subject: Re: [EE]  large USB power banks
Thread-Topic: [EE]  large USB power banks
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Hi there, David.

I've purchased MANY USB power banks over the past few years.  Most=20
recent batch is from Adata, purchased from Memory Express in=20
Canada.  They had a rocking deal of Can $7.99 for 10.05AHr.  These=20
contain 3 cells (3P) - these cells are physically larger than=20
18650.  I don't have the disassembled unit handy right now.  I'll=20
grab it later today and let you know the actual cell dimensions if=20
you are interested.

I haven't run a full capacity test yet - I will do that this=20
weekend.  But any of the previous Adata units that I have purchased=20
previously have contained cells that match the advertised capacity.

I had wanted to purchase 30 of these power banks - I was going to=20
pull the cells from them and build a decent battery box for my=20
electric scooter.  Basically, 14 sets of two in series-parallel (14S=20
6P).  Unfortunately, was not able to get that many.

Another unit that is decent is from Limefuel - it says 20,000 mAHr=20
but I haven't actually measured it.  But it has been reliable for=20
several years.

dwayne


At 09:56 AM 2/14/2020, David Van Horn wrote:
>I'm looking for a couple of large USB power banks, and hoping to get=20
>some recommendations.
>I see mAh ratings that are starting to sound like stun gun voltages,=20
>which is why I'm not just grabbing the biggest number on Amazon
>
>The application is astrophotography, running a bunch of peripherals=20
>including a lens heater.
>
>--
>David VanHorn
>Lead Hardware Engineer
>
>Backcountry Access, Inc.
>2820 Wilderness Pl, Unit H
>Boulder, CO  80301 USA
>phone: 303-417-1345  x110
>email:=20
>david.vanhorn@backcountryaccess.com<mailto:david.vanhorn@backcountryaccess=
..com>


--=20
Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
780-489-3199 voice   780-487-6397 fax   888-489-3199 Toll Free
www.trinity-electronics.com
Custom Electronics Design and Manufacturing

--=20
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