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Thread: Power Bank Asus TF700T

  1. #1
    Soundwave
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    Power Bank Asus TF700T

    I am so excited about finding a power bank that I wanted to share it with the other frustrated Asus owners.

    I have needed a portable battery/power bank and have been very frustrated finding one that would charge my Asus Transformer TF700T tablet. As we all know, Asus has a very peculiar power requirement. We are restricted to using Asus chargers. I had conducted extensive research through the Transformer forum, NewEgg, Amazon, Asus, battery manufacturers, and everywhere else, yet could not find a power bank that would work.

    Others may have already figured out this solution, but I wanted to share my discovery with those who have not. The answer was simple, to buy a power bank that had a full-powered AC Outlet. I recently purchased the Rosewill Plasma-mini PB-U2-12000-BK through NewEgg ($75) and was pleasantly surprised when it worked to charge my tablet.

    Rosewill Plasma-Mini Black 12000mAh Universal AC Portable Power Bank for Laptop / Smartphone / iPhone / iPad / iPod / PSP - Newegg.com

    It has a 65 watt (120 volt) AC Outlet so I simply plugged my Asus wall charger in and voila, the Asus charges like it was plugged in to a wall outlet. Because it is a fully powered AC outlet, I assume it will charge any Asus tablet.

    It also has a 5V/2.4A USB port that will charge the tablet, but at a slower rate. I have yet to test the USB charging speed, but it seemed to about 3mins per % (5% increase over 15 minutes). I expect to get 2 to 4 full charges per power bank charge.
    Don't Panic!

  2. #2
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    Welcome to the forum

    You can charge your TF using the USB port but the output from that USB is only 5v and the TF requires 15v to properly charge, so it will, but it will be SLOW.

  3. #3
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    While a system like that will work, it is so needlessly complicated that it is bound to be horribly inefficient. Maybe the power requirements are low enough to not matter, but from an engineering standpoint it's inelegant. Call me anal if you wish (I've been called much worse), but that would bother me enough to try to improve it.

    If I needed a portable pack for my TFs, I would buy three small 5V packs and wire them in series, possibly by cutting up some old USB cables and doing some soldering.
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  4. #4
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    Quote Originally Posted by Kevinthefixer View Post
    If I needed a portable pack for my TFs, I would buy three small 5V packs and wire them in series, possibly by cutting up some old USB cables and doing some soldering.
    I would need to see a picture before I believe that would be an "elegant" solution! ;p

  5. #5
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    I don't think the charging circuit for Kevin's contraption would be very elegant. At the same time, having a 120v ac outlet on a portable battery seems dangerous. Must be very low amperage.
    *I apologize for any spelng mistakes. I frequently answer questions on my phone. The content is (usually) good, but the words may not be intelligible. If you cant understand my post... check back later or call me out on it.
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  6. #6
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    "Elegant" as in the engineering term, not meaning gilt and carved wood banisters. That is to say, not taking a DC source, running it through an oscillator, boosting that AC signal to 120V, then reducing that 120VAC to 16 or so, then running that through a bridge rectifier to finally achieve ~15VDC. Simply wire three 5V batteries in series to get a single 15V battery.

    How pretty the result might be would be up to the wirer. Or wirehead, as the case may be.

    My visual of the setup just has a small box with three male USB plugs protruding from one end for the battery packs and one female from the other end for the TF charge cable. Hide all the sloppy soldering and black tape inside the box. Charge it with whatever the batteries came with for charging.
    Last edited by Kevinthefixer; 03-15-2015 at 08:03 PM.
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  7. #7
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    I was in the 99-cent store this AM, and they had portable power banks for US$1.99. Apparently this discussion has been bothering me, because I immediately flashed on it and bought three of them. The hardest decision I think was what to use for a "black box". It being that time of year, I came perilously close to making this thing out of a plastic Easter egg, but I found a little plastic box just in the nick of time. It also almost ended up looking like a giant M&M, but the giant M&M still had real M&Ms in it, even if they were several years old and probably no good.

    CAM00026.jpg

    Ran the wires and hooked them up as I described above. USB cables have four wires, the red and black ones are used for 5V power, for this project we can cut the white & green ones short and ignore them. I discovered that wires are getting finer and finer, while my eyes and steady nerves are decidedly not. However I managed to solder the joints, but rather than attempt to wrap them with electrical tape I simply coated them with hot glue. Glued the cables in place too for a strain relief.

    CAM00044.jpgCAM00046.jpg

    Thought I had a problem. Seems these cheapie batteries will only charge to about 4.1 volts. I was afraid they would overcharge, and I was prepared to add a diode or two to knock the voltage down (putting a diode in will reduce the voltage by about 1/2 volt), but I wound up with 12.3V in the finished product. However this is enough for the transformer, took it from 86% to 100 in less than 1/2 hour. I'll have to give it a good test, of course, but if I want to improve the specs of the setup, I'll just have to spring for better battery packs. I couldn't be happier with my cobble job here, unless of course it looked like a giant M&M.

    CAM00048.jpg
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  8. #8
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    Great job! But I SO wish you'd put into a giant pink easter egg! :lmao:
    Swipe likes this.

 

 

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