Low cost battery supply.

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martinayotte
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Re: Low cost battery supply.

Post by martinayotte » Fri Jan 29, 2016 2:52 am

I've already received 4x 9800mAh and 6x 10000mAh, untested yet ... :-)

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ahull
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Re: Low cost battery supply.

Post by ahull » Fri Jan 29, 2016 12:03 pm

martinayotte wrote:I've already received 4x 9800mAh and 6x 10000mAh, untested yet ... :-)
:( I suspect 4 x 2350mAh cells for a total of 9800mAh and 6 x 1666mAh for a total of 10000mAh, since wild claims of capacity tend to be inversely proportional to actual capacity, but I could be wrong..
- Andy Hull -

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mrmonteith
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Re: Low cost battery supply.

Post by mrmonteith » Fri Jan 29, 2016 12:49 pm

The are the ones I got. Realistic or not they will be more power than I would need.
50PCS 3.7V 5800mAh 18650 Li-ion Rechargeable Battery For Flashlight From USA

At $.36 a piece I can't complain. One already went to my wife's emergency phone battery pack. If anyone wants any I'll be glad. Just help me pay shipping. Unless I get wild with projects and have a lot of Christmas presents to give away it's unlikely I'll use all 50 for a while. If you do want some PM me.

Michael

darth_llamah
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Re: Low cost battery supply.

Post by darth_llamah » Fri Jan 29, 2016 12:58 pm

mrmonteith wrote:50PCS 3.7V 5800mAh 18650 Li-ion Rechargeable Battery For Flashlight From USA
I wonder if real capacity is below or over 1000mAh :lol:
Still for use with a flashlight/led lamp at home they would do

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martinayotte
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Re: Low cost battery supply.

Post by martinayotte » Fri Jan 29, 2016 2:29 pm

ahull wrote:
martinayotte wrote:I've already received 4x 9800mAh and 6x 10000mAh, untested yet ... :-)
:( I suspect 4 x 2350mAh cells for a total of 9800mAh and 6 x 1666mAh for a total of 10000mAh, since wild claims of capacity tend to be inversely proportional to actual capacity, but I could be wrong..
Andy, as I posted earlier in this thread, those values are actually what the GTF manufacturer has written on it. Lot of answers were that chinese manufacturers are lying on their labelling. I will have to perform some tests to figure out the truth. :(

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mrburnette
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Re: Low cost battery supply.

Post by mrburnette » Fri Jan 29, 2016 2:30 pm

At under $1 each, who really cares? Puts 'em in the category of AA alkaline cells. Looks like mrmonteith is happy and maybe we can impose on him to give use an update report in about 3 months.

Ray

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mrmonteith
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Re: Low cost battery supply.

Post by mrmonteith » Fri Jan 29, 2016 4:06 pm

mrburnette wrote:At under $1 each, who really cares? Puts 'em in the category of AA alkaline cells. Looks like mrmonteith is happy and maybe we can impose on him to give use an update report in about 3 months.

Ray
No kidding. I'm looking at getting one of these.
iMAX B6 RC Lipo NiMh NiCD Battery Balance Charger Discharger LCD Screen Digital
It would be handy to have around and also work for testing supercaps as well.

No matter what their capacity is, for most projects it would power them for quite a while anyway. I'll be glad to share any findings. Plus good to have extra feedback in case I miss something in my testing. I did find some button style supercaps that would be handy on projects too.

BTW, thanks for the link to the Battery University. Helped me to catch up on the different battery types, uses, etc. Tons of information.

Michael

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mrburnette
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Re: Low cost battery supply.

Post by mrburnette » Fri Jan 29, 2016 4:50 pm

mrmonteith wrote: <...>
It would be handy to have around and also work for testing supercaps as well.
<...>
Michael
Affirmative.
Just remember that supercaps are a beast unto themselves. They behave like capacitors in that the electric charge builds from 0 to 100% and conversely for discharge. They have an extremely low internal impedance, from a DC perspective, a charged supercap is a dangerous as a charged lithium battery if shorted - very large current flow.

You may find this interesting: https://www.tecategroup.com/ultracapaci ... or-FAQ.php

DC-DC power supplies may not expect such long charge delays as a supercap provides; that is, smart supplies may see a supercap as a dead short and simply shut down.

Have fun.


Ray

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ahull
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Re: Low cost battery supply.

Post by ahull » Tue Feb 09, 2016 11:06 am

Cheap LiPos revisited...



... cheap batteries with massively overstated capacities are cheap for a reason. The tiny cells inside the ones in the video cost a few cents each in large volumes, so converting them in to 18650 cells and charging a dollar for them makes a big profit. Those thin cylindrical cells are used in disposable e-cigarettes amongst other things.
- Andy Hull -

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mrmonteith
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Re: Low cost battery supply.

Post by mrmonteith » Tue Feb 09, 2016 12:53 pm

I've got 40+ of these I can deconstruct one of them and see. But now I need to find what a real one has in it. But for the cost of them they'll do what I need anyway.

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