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Batteries & Chargers Discuss Li-P, Li-Ion, NiMh, Nicad battery technology and the chargers that juice 'em up!

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Old 02-17-2012, 10:43 PM   #1
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Default 10S2P 2300 Mah A123 Battery Pack

I've ordered and just received 22 of the 2300 Mah A123 cells from www.voltmanbatteries.com. (http://www.voltmanbatteries.com/serv...1-dsh-A/Detail) This is my second order from this company, and several other club members have also ordered from them. We've all been very satisfied with this company. It's located in Ohio.

It looks like the main business of voltmanbatteries is rebuilding power packs for portable battery operated tools.

These cells come with spot welded straps that are readily solderable. I've cut the straps off, and soldered heavier copper straps to what is left of the spot welded straps.

Next, my supply of #22 ribbon wire is gone, so have just placed an order for more. Not cheap at $2.50 per foot, but IMHO well worth it. Will put the final photos on this thread after the ribbon wire is connected.

This pack is configured as two 5S2P packs so it can be charged as a 5S4P pack on a Cellpro Powerlab 8 charger. The charging rate will be about 25 or 30 Amps. The motor is a Hacker A60-5S, the model is a Top Flite Cessna 182 Skylane. So far with everything except the wheel pants and similar items, the model weighs in at 14.5 Pounds. As usual, ounces come out of nowhere during final assembly, so it looks to be about 15.5 pounds when done. The 10S2P A123 battery pack weighs in at 54 ounces without power wires.

The Castle Creations 80 Amp HV ESC was sent in to CC about three weeks ago for their recall, still waiting for its return.
It took awhile to locate #22 gauge ribbon wire, finally found some here:
http://www.jammaboards.com/store/3m-...e-8124-10.html

Take a look at the photos of the battery pack in progress.


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Old 02-18-2012, 09:54 PM   #2
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I dont get why theyre so expensive.You would think they would sell a lot more if they cost less.I know I would buy them if they werent so expensive.
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Old 02-18-2012, 10:27 PM   #3
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Default

Originally Posted by Rolling Thunder View Post
I dont get why theyre so expensive.You would think they would sell a lot more if they cost less.I know I would buy them if they werent so expensive.
Yeah
Voltmanbatteries sells them for $9.99 each, and you can find them direct from China for about $8.50. But, having purchased some from China, never again.

The China shippers packed 24 of those A123 cells absolutely loose inside of a big plastic bag. Many cells were dented, but that was three years ago, and I'm still using them.

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Old 03-05-2012, 04:15 AM   #4
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Too expensive, I'd rather buy them from China.
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Old 03-05-2012, 04:21 AM   #5
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Originally Posted by joehjor View Post
Too expensive, I'd rather buy them from China.
Sounds good. I've heard of other people buying those A123's direct from China. The plastic bag ripped, and most of the cells fell out. The China supplier refused to do anything about replacing the missing cells.

Hopefully they've improved their shipping packaging by now.

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Old 03-07-2012, 03:08 AM   #6
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Default Status Update, Battery Pack Wiring Completed

Just finished wiring up this battery pack. The battery is configured as two separate 5S2P A123 packs under two of those grocery store 1 liter bottle "Shrink Wrap". The Anderson Powerpole connectors are configured to allow powering the ESC/motor as a 10S2P pack, and charging this same pack as a 5S4P pack.

The AP and balancer connectors are epoxied into a piece of 1/4 inch plywood to allow mounting inside the model airplane. Not to happy with the ribbon wire I purchased though. It is not very flexible. At any rate, once installed in the model, both the battery and AP/Balance assembly will be solidly mounted in the airplane.

Now, after near 6 weeks, I'm still waiting for Castle Creations to return my 80 Amp HV ICE ESC after CASTLE CREATIONS recalled it. (Can't even get them to confirm that they have received my ESC!)


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