RE: A123Racing Battery Questions (Full Version)

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SS Pede -> RE: A123Racing Battery Questions (4/3/2007 1:16:21 AM)

I see that A123 revealed new packs with a new form factor at RCX 2007!!! I'm eager to get more info...though they're probably very similar except for shape.



SS Pede -> RE: A123Racing Battery Questions (4/4/2007 7:51:41 PM)

Maybe Brian can shed a bit of light on the details of these new packs...like prices, when they'll be available, that sort of thing. [:)] [;)]



Red Scholefield -> RE: A123Racing Battery Questions (4/5/2007 12:59:10 AM)

It will be interesting to see if they show up at Toledo. IT should tell us if they are serious about the electric flight market or not. Heard a rumor today that they had signed an exclusive with a major distributor. LIST PRICE OF SINGLE CELLS $19.95. WHICH TELLS ME THEY ARE NOT SERIOUS! But then they may know the market better than I do and realize that there are few in the hobby today that have the expertise to tear a DeWalt pack down and salvage the cells for $10-12 each. Maybe a new cottage industry opportunity here. [:D]



RC Accessory -> RE: A123Racing Battery Questions (4/5/2007 1:09:38 AM)

Red, it is true. Go to www.horizonhobby.com and search for A123. $19.95 per cell.

Evan



dick Hanson -> RE: A123Racing Battery Questions (4/5/2007 1:34:56 AM)

that list price is a bit of a surprise ---
I am now using the 2 cell packs, as rcvr packs (as well as using 4 cell packs in an electric model)
I make the rx pack by adding a std heavy duty JR pigtail- (all three wires ) and some heatshrink. I converted one pack from the two wire pack I got from RC Accessory. I just HAD to see if balancing was really req'd
I access em thru a JR charge plug/switch -- which accepts a JR female plug, adapted to a CellPro charger pigtail
It could not be easier or more simple - I recharge or check whilst refueling the gas tank on my 33% /42% or 27% gassers
the big gasser gets two packs simply because it has dual switches in place and 5 more ounces on 40 lbs means nada.
It is really handy to plug in and see "remaining is 80% charge " on the Cell Pro screen then the thing is charged up again shortly after refueling .
no friggen regulators either --
One other thing-- waiting for final balancing is really not worth the delay just as soon as you see 100% --
go fly but rebalance if you want to --
I also got one of the Dapter chargers for my ASTRO super 12
this is really slick - I use the "goose mode" and up comes the voltage --and STAYS up! big surprise. They should call it the Viagra mode.
My airyplanes is all changing to 123 cells.



Red Scholefield -> RE: A123Racing Battery Questions (4/5/2007 2:36:00 PM)


quote:

ORIGINAL: RC Accessory

Red, it is true. Go to www.horizonhobby.com and search for A123. $19.95 per cell.

Evan


Amazing when there are a dozen DeWalt 36 volt packs on e-Bay right now at a max cell cost of $15 including shipping. Making your own packs from these is SO easy a cave man could do it. [:D] You can come up with a couple 4S packs without having to solder between the cells, just add the leads and balance connector of your choice. Make up packs using the MEC power tube concept with the other two cells - buy two DeWalt packs and end up with 5 4S packs for under $300. I've been flying the A123 packs since June - and they are fantastic in my 40 size electric conversions.



BTerry -> RE: A123Racing Battery Questions (4/5/2007 5:08:13 PM)

These cells are $15.50 each from MEC, but they don't have solder tabs (set up for the Power Tube). I think we will see a lower price from Horizon eventually, but they don't like to undercut their LHS customers.



carbonater55 -> RE: A123Racing Battery Questions (4/10/2007 2:26:40 PM)

---------------------------------------------------
II am confused. Hobbico said they thought that the 2- 2 cell 7.4 volt batteries would be needed to operate this plane. But that would be 1 volt short of the 8.4 volt pac's they reccomend.
Looking over these specs. what would you reccomend?
-----------------------------

SPECIFICATIONS
Stock Number: HCAA12**
Wingspan: 63 in (1600 mm)
Wing Area: 709 sq in (45.7 dm2)
Weight: 6-6.5 lb (2720-2950 g)
Wing Loading: 19-21 oz/ft2 (59-64 g/dm2)
Length: 53 in (1345 mm)
Includes: Futaba® 4EXA 4-channel computer radio w/R168 receiver and 3 servos, 42 mm brushless out-runner motor, Great Planes® ElectriFly 45A brushless ESC
Requires: (2) 7-cell 8.4V 3000 mAh NiMH battery packs (GPMP0355) OR (2) 7.4V 3200mAh 20C discharge batteries with balance (GPMP0622), Dual Peak Charger (HCAP0255



Bob93447 -> RE: A123Racing Battery Questions (5/26/2007 7:00:36 PM)

Brian,

Is it possible to use the entire Dewalt 36v power pack in a model application? I'm thinking of using the DeWalt power pack in my Seawind on the assumption that it might be a bit safer if dunked.


Bob
93447



DLS II -> RE: A123Racing Battery Questions (5/31/2007 4:15:23 PM)

Batfish, I'm setting up a TC with a 10.5 and a MEC SPT A123 2S2P pack. Will the gearing up trick work here to? I hope so! One battery pack race all day! A123Racing, will the Turbo module work with 10.5 & 13.5 brushless? Thanks, Don



meatpuppet -> RE: A123Racing Battery Questions (6/9/2007 5:13:02 PM)

Can someone post a pic of these batteries in comparison to a thunder power 3 cell lipo. I still am not sure about their actual size. How large is each cell?


thanks



guver -> RE: A123Racing Battery Questions (6/9/2007 7:03:32 PM)

They are a C size battery.



Red Scholefield -> RE: A123Racing Battery Questions (6/9/2007 10:18:17 PM)


quote:

ORIGINAL: guver

They are a C size battery.


Yes, same as C diameter 1.024 inches, but some what longer than a C cell. A123 is 2.62 inches, C is 1.97 inches



guver -> RE: A123Racing Battery Questions (6/9/2007 11:03:53 PM)

Wow, I didn't know that, Thanks for the correction.

That brings up another. Why is it that can only get 2300 capacity in this size? If it was a nimh battery it would have 6000 + at far less voltage though.



Red Scholefield -> RE: A123Racing Battery Questions (6/10/2007 1:44:26 AM)


quote:

ORIGINAL: guver

Wow, I didn't know that, Thanks for the correction.

That brings up another. Why is it that can only get 2300 capacity in this size? If it was a nimh battery it would have 6000 + at far less voltage though.


Different chemistries. A123 has 7.8 watt hours, and Ni-Mh has 7.2 using your figure of 6000 mAh. Weight also comes into play here, A123 is 72 grams. Ni-Mh would come in around twice that or a bit more.



lillbill11 -> RE: A123Racing Battery Questions (6/11/2007 10:07:27 PM)

NEW TO A-123'S, CAN YOU STILL CHARGE THEM IF YOU GO BELOW 1.0 VOLTS ?
IF NOT IS THERE ANYTHING YOU CAN PUT IN THE PLANE TO KEEP IT FROM GOING BELOW 1.0 VOLTS.



A123 Racing -> RE: A123Racing Battery Questions (6/12/2007 6:53:59 PM)

Hello Bill,

If the cells are brought below 1V then you should individually charge each cell in the pack with 100mAh until the cell is greater than 1V. Even with this method the cells may not recover. To answer your question about keeping the pack above 1.0V / cell in your plane; Your plane will not sustain flight at dangerous low voltage levels. For example if you are flying a 4S pack you will need to land well before the voltage of the pack reaches 4V. Also, most electronics run at a minimum of 5V so things will start shutting down before you could do any damage to the pack.

You should be sure to unplug the battery from the system when not in use as RC electronics have a tendency to slowly drain packs.

I hope this answers your questions, let us know if you have any more.

Power . Safety . Life

Brian


[image]http://www.a123racing.com/images/Animated-Banner_r0.gif[/image]



captinjohn -> RE: A123Racing Battery Questions (6/22/2007 10:03:23 PM)

Can a123 pac be used in a small 540 Edge Airplane? It has a 25 amp motor and a 25 amp speed controller. My Grandson just bought the airplane used all set to go except no battery? Thanks Much, Capt,n P.S. the Airplane is about 30 inch span.



Red Scholefield -> RE: A123Racing Battery Questions (6/23/2007 12:23:28 AM)


quote:

ORIGINAL: A123 Racing

Hello Bill,

Also, most electronics run at a minimum of 5V so things will start shutting down before you could do any damage to the pack.
I hope this answers your questions, let us know if you have any more.
Power . Safety . Life
Brian


Brain, you should really learn a bit more about Radio Control systems to be able to give advice. Most radio systems don't shut down until you approach 3.6 volts. 4.8 volts is the nominal operating voltage. It is true that most ESCs shut down power to the motor at a higher level (usually programmable) but they supply 5 volts to the radio/servos for much longer. Maybe this is where you got the 5 volts from.



Richard D Bahmann aka/Wrongway -> RE: A123Racing Battery Questions (6/23/2007 12:53:10 PM)

Question, the specifications show an internal impededence of 8 milli-ohms per cell. Does this number change when running say a two cell setup for 6.6 v ?

Thanks



Red Scholefield -> RE: A123Racing Battery Questions (6/23/2007 2:13:50 PM)


quote:

ORIGINAL: rdb127

Question, the specifications show an internal impededence of 8 milli-ohms per cell. Does this number change when running say a two cell setup for 6.6 v ?

Thanks


The per cell number does not change, but the number for a two cell pack becomes 16 milli-ohms total internal resistance. Neglecting any interconnect resistance which should be minimal.



captinjohn -> RE: A123Racing Battery Questions (6/23/2007 4:57:13 PM)

RED.....do you have a answer for my question....just a few postings ago? Thanks Capt,n



biodiversivist -> RE: A123Racing Battery Questions (6/23/2007 5:54:53 PM)

Hey all,

I just fried the third controller in my dewalt 36 volt battery pack. I have bought two on this forum before with pay pal. Anybody out there want to sell me a couple from their disassembled packs?

Russ
finleylester@hotmail.com



Red Scholefield -> RE: A123Racing Battery Questions (6/23/2007 6:04:49 PM)


quote:

ORIGINAL: captinjohn

Can a123 pac be used in a small 540 Edge Airplane? It has a 25 amp motor and a 25 amp speed controller. My Grandson just bought the airplane used all set to go except no battery? Thanks Much, Capt,n P.S. the Airplane is about 30 inch span.


At 2.5 oz/cell they might be a tad heavy. You would need at least 2 cells to give you around 7 volts and that would be 5oz.



Red Scholefield -> RE: A123Racing Battery Questions (6/23/2007 7:41:58 PM)


quote:

ORIGINAL: biodiversivist

Hey all,

I just fried the third controller in my dewalt 36 volt battery pack. I have bought two on this forum before with pay pal. Anybody out there want to sell me a couple from their disassembled packs?

Russ
finleylester@hotmail.com


How did you do that? My buddy mapgap@bellsouth.net might have one or two.





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