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AA batts for motor power

Old 01-30-2005, 11:33 AM
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expeditionx
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Default AA batts for motor power

Hi

I was wondering if rechargeable Sanyo AA batteries could drive a boat? I mean with the 9 or 10 amp draw without frying. I was thinking of getting 4 AA's in one pack then get another 4 AA's in another pack, then use a Y harness to link them together. I figure that I should get a gain if each set of packs has 6v and 1500 mah. I think that would be 12v and 3000 mah which = POWER! Any suggestions would be helpful. Thanks
Old 01-30-2005, 03:57 PM
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Default RE: AA batts for motor power

I'd like to know how many amps can the AA nimh deliver safely?
Old 01-30-2005, 05:05 PM
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Default RE: AA batts for motor power

Well I am going with the Sanyo 2400 mah AA. I am going to series connect it so it will still get 2400 mah but the volts would increase to 9.6 v approxamently with 8 of them. Im guessing that it would probly weigh as much as a standard 6 cell pack that gets 7.2v at whatever amps.
Old 01-30-2005, 06:19 PM
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Default RE: AA batts for motor power

expeditionx,
If you put two 2400 mAhr 6 volt battery packs in series you get 12 volts at 2400 mAhr. If in parallel, you get 6 volts at 4800 mAhr. You can't get 'free' power (power = V x mAhr), but you can determine the voltage and current available in the system. Voltages 'add' in series, and current is the same. Currents 'add' in parallel and voltage stays the same. (There's always something to 'mess up' a good idea, huh?)
- 'Doc
Old 01-30-2005, 06:39 PM
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expeditionx
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Default RE: AA batts for motor power

Sigh.. theres always a catch to a good idea.
Old 01-30-2005, 07:12 PM
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Default RE: AA batts for motor power

yea lol, how then does the villian ex utilize 2 7.2 voltage packs as a 14.4 volt system? is it in the speed controll?
Old 01-30-2005, 07:23 PM
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Default RE: AA batts for motor power

When I had my villan IV, the only thing the extra battery did was put more mah in the system. mabie the Ex has it set up where it wont get any more mah but the voltage would dubble. I think if you take one pack out the boat wont run as fast because it's back to 14v.
Old 01-30-2005, 07:27 PM
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Default RE: AA batts for motor power

your a little confused, the original villian yes had a 7.2 vlt system, hovever the new villian ex boat has a 14.4volt system, therefore if you take one battery out your back to 7.2 volts, and yes it would go slower due to less voltage.
Old 01-30-2005, 07:34 PM
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Default RE: AA batts for motor power

Ok I get it now. hum.. well do you think the speed controler is multiplying the volts by two? So you get the 27v. But then your amps would go way down.
Old 01-30-2005, 07:40 PM
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Default RE: AA batts for motor power

where you getting 27? 7.2 volts X 2=14.4 volts. 2 ?'s 7.2 packs use i think c cell batteries. i dont think AA batteries would last that long. IF they would, just make a huge 14.4 volt pack?
Old 01-30-2005, 07:48 PM
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Default RE: AA batts for motor power

With the AA batteries I was hopeing to acheve the same power as a standard 6cell pack or vise versa but weigh less to gain more speed. Even thogh it wont run as long.
Old 01-30-2005, 08:53 PM
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Default RE: AA batts for motor power

ohh
well i guess you could do it, just make one larger pack.
Old 01-31-2005, 03:43 PM
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Default RE: AA batts for motor power

All sounds good with your idea, the question is the amp draw on the AA batteries. I'm considering using AA in my mini truck, but it averages 6-10 amps and I'm not sure about the batteries delivering this amount of current.

If your boat really only draws 9-10 amps you may get away with it. where to get the 2400 AA's?
Old 01-31-2005, 05:00 PM
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Default RE: AA batts for motor power

http://www.funrcboats.com/ProductInf...uctid=PHLBH343

I was thinkning of also useing that battery connnector that shows up in that link. The wires look kind of small but no problem, just get some 14, or 12 guauge wire instead.

The batteries are accualy 2300 mah. but still good.
Old 01-31-2005, 05:06 PM
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expeditionx
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Default RE: AA batts for motor power

Oh

I forgot to tell you that I also ordered 10 of the AA's with the connector. I should be getting it within a week or so. Ill post again with the news on how it went.
Old 01-31-2005, 05:47 PM
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stevblutu15
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Default RE: AA batts for motor power

did you take a look at www.onlybatteries.com?
Old 01-31-2005, 06:11 PM
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Default RE: AA batts for motor power

Thanks Stevblutu!

Great site. Ill realy help with what im after.
Old 01-31-2005, 06:12 PM
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Default RE: AA batts for motor power

they are pretty cheap, cheaper than most places i know of.
Old 02-01-2005, 02:05 PM
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Default RE: AA batts for motor power

Just a word on wiring. If you are looking at less than 15 amps, you can use 14 guage wire. If you are looking at less than 20 amps, you can use 12 guage wire. Wire is like a hose, it can only handle so much. You need to know what your current is going to be and buy wire big enough to handle the load with a little capacity to spare, other wise you are looking at a meltdown that can cost you some serious $$$$$$$$$ to repair. One other word of advice is if your are going to need to bend the wires each time you put them in or take them out of the boat, use stranded wires. The solid won't take it very many times before breaking.

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