Poll: whats your favorite size portable power pack?
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1 cell
0%
0 0%
2 cells
0%
0 0%
4 cells
60.00%
3 60.00%
6 cells
20.00%
1 20.00%
8 cells
20.00%
1 20.00%
Total 5 vote(s) 100%
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4 usb port power pack
#1
So i just bought a new power pack on ebay for $2.50 usd. Not a bad little unit since it came with a case marked 20k mah eith room for 6 18650s and a easy to solder circuit board. This will be my third diy power pack so its kind of addicting. It has a micro usb charge port and 4 usb outputs. Havent done any testing yet but looking foward to putting it to use.
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#2
Well, I don't have one at the moment since I don't have a use for one right now. But I did in the past I usually went for bigger ones like 6 or 8 cells. If I will need one at some point in the future I will probably build a small one but build it in such a way that the 18650s are easy swappable. So it will have basically unlimited capacity as long as I have charged cells available.
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#3
Cant vote. I use 1slot for light travel. 4 slot for flight and other and 8slot for long hikes and stuff... Tongue
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#4
I vote for the 4 cells. Occasionally I will build a single cell power bank. But 4 cells seems to be the best balance as far as portability and charge times go.

I have thought about building a monster 8 pack for traveling. I will put an external connector on it, so I can charge it with my iMax clone.
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#5
I opted for a 8-cell power bank. Around €2.50 from ebay, 2x 2.1A + 1x 1A USB outputs, plus a dual led light. This thing's got a percentage screen which is rubbish, since it's all around the place, looks like it just goes down as time goes by, nothing to do with actual soc of the cells. At least it does shut down at around 3V. I also had to use a dremmel on the inside of the case, since the fit was a bit too tight and the bottome cell would not make contact properly.

I put inside 8 liberated cells that tested to an average of under 400mAh under 1A load due to high internal resistance, however they are all above 1200mAh when tested at 500mA. That said, I suspect their cumulative capacity to be around 10000mAh under real life usage. I believe these 8-cell cases are the best way to put old cells to good use, up until they get so old that they start self-discharging on their own.

Do you know of a way to measure the total capacity that's coming off of the USB port?
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#6
I go for the 4 cell. Most of the 3 cell seam to have overheating issues. It is rather strange how little is on these boards. When you get a better pack from store, the board has more then double the components. With the thermostat being only functional difference.
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#7
I mainly use my 28 cell FrankenBank lasts a week or two charging my tablets, phone etc

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                                                Choose LiFe  Wink

                      May all your batteries be fully charged and perfectly balanced  Cool
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