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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 10-01-2011, 08:05 AM   #1
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Default Nimh selection + A123 selection

Hey guys!! I have access to huge number of nimh batteries . I wanted to use them on a 2212-6 motor. Can you please tell me what should be the rating of the battery. or the exact name of the Nimh battery you have used successfully on a 2212-6 or similar motor.

-n3o
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Old 10-01-2011, 12:38 PM   #2
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What type/size of cells are they AA? Some will work fine but others won't take the amp draw.
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Old 10-01-2011, 02:40 PM   #3
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Originally Posted by rcers View Post
What type/size of cells are they AA? Some will work fine but others won't take the amp draw.
yeah they are in different sizes.Can you recommend specific one which i can use with a2212-6 motors?
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Old 10-01-2011, 03:40 PM   #4
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That's a fairly high amp draw motor. If your NiMh are like retail grade (AA off the shelf) they simply won't do it worth the bother.
You want to try you'll need ~ 10 of them for ~12v. Weight can become an issue pretty fast.

fly
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Old 10-01-2011, 04:36 PM   #5
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Originally Posted by flydiver View Post
That's a fairly high amp draw motor. If your NiMh are like retail grade (AA off the shelf) they simply won't do it worth the bother.
You want to try you'll need ~ 10 of them for ~12v. Weight can become an issue pretty fast.
yes , the auw is beyond acceptance. But then, what motors are ideal for nimh batteries? the small ones requiring 15A esc? considering the AUW i am guessing that only gliders can utilize whatever punch the battery has to offer!!
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Old 10-01-2011, 04:41 PM   #6
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Lots of motors run fine on NiXX. My old Super Cub was NiMh powered as is the stock Easy Star.
It all depends on what the NiMh actually ARE performance wise, and what kind of weight you'll accept. The car guys still use them but they don't use consumer grade NiMh.
The battery has to be designed for higher output (lower internal resistance) for higher power applications. The 2212-6 is a high KV fairly high performance small motor.

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Old 10-01-2011, 07:14 PM   #7
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Sub C cells would be nice - what do you have?
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Old 10-01-2011, 07:31 PM   #8
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The good (for motor current) NiMH batteries are nearly all short fat ones...like Sub-C or 2/3A sizes. I still use a few of those.

The commercial sizes like AAs will rarely provide enough current and the higher the capacity crammed into them the less likely you are to get high currents out of them.

Steve
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Old 10-01-2011, 10:34 PM   #9
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+1 - what Steve said - 2/3 A cells likely OK too. NOT AA's. Small sub C's too 1300's or so.

Mike
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Old 10-02-2011, 02:44 AM   #10
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Originally Posted by n3o View Post
Hey guys!! I have access to huge number of nimh batteries . I wanted to use them on a 2212-6 motor. Can you please tell me what should be the rating of the battery. or the exact name of the Nimh battery you have used successfully on a 2212-6 or similar motor.

-n3o
Depends on the type of Nih batteries you have. The quality and internal resistance of these batteries can vary all over the map. A lot of those "AA" size Nih batteries with 2000 Mah plus just can't put out the current these motors can pull.

For an AA Nih battery, anything over a few amps is suspect. A while back, I did a 12 Amp high current testing of a 2700 Mah 5 cell name brand AA battery. At 12 Amps, that battery dropped to 3.6 Volts DC.

If you're planning to put this setup into a model airplane, you are going to pay the penalty for a lot of extra weight, as compared to a LiPo, or an A123 2300 Mah cell.
Take a look:
http://www.wattflyer.com/forums/showthread.php?t=47965

DennyV
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Old 10-02-2011, 09:26 AM   #11
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wow thank you all for very informative replies! well the nimh i have are sub-c types as well AA, but the guy showed me a HR-4/5AUP pack which he said is used for rc planes. keeping in mind the weight penalty, i will be using nimh on supercub just like flydiver. for fast parkjets i will stick to lipos!!

-n3o
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Old 10-02-2011, 05:06 PM   #12
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Let us know if that works out for you. No one I know actually goes back to NiMh after they've tasted lipo, not even on the super cub.

fly
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Old 12-01-2011, 02:01 PM   #13
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Default High rate NiMH AA's

If you're committed to the NiMH platform and you want some smaller lighter ones that will yield high amps, they do make 10c AA's and even some smaller varieties. I have a ton of the 2000mah 10c AA's that in fact yield discharge rates of 20amps continuous if you're interested.
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Old 12-02-2011, 04:21 AM   #14
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Originally Posted by flydiver View Post
Let us know if that works out for you. No one I know actually goes back to NiMh after they've tasted lipo, not even on the super cub.
No it didn't .. partly because of my amateur attempts =D .. and partly because of my poor electronics knowledge =(
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Old 12-02-2011, 04:28 AM   #15
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We learn more from our mistakes than our successes.
Therefore > success!

fly
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Old 12-02-2011, 04:46 AM   #16
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Default Nimh selection + A123 selection

After a long search I found this battery pack in an abandoned project of some solar powered car. I removed the covering tape and found this!! but i cant find any kind of markings on them i.e A123 or Moli but they do seem more like moli. =D

please help to recog these cells... and how i can use 'em.

-n3o

P.S: how do i remove those strips without damaging the cells?


oh and its 4 " in the last pic


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