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Old 07-20-2006, 09:02 AM   #1
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Default 2.700mah Receiver AA Batts, worth it ?

Hi,

Im racing a Jammin FTE and found this receivers batteries on amainhobbies.com :



They are 2.700mah, AA hump pack and say that on a Jammin they go on its side, and you have to use a small receiver, but does not say how small !! (im using the Spektrum PRO one) ... and, does not say how much weight ...

Do you think it worth to buy ? ... here is the link with the complete description :

http://www.amainhobbies.com/product_...oducts_id/7001


thanks,
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Old 07-20-2006, 09:53 AM   #2
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Definitely worthwhile. I didn't buy one made, I just went to Wally World and picked up some Duracell NiMH rechargables and built my own. Yes, you lay it on its side and stand your receiver up on its end. It works just fine. I don't ever bother recharging my pack for a race day. It'll last all through practice, 3 quals, and a 15 min. main with no fade.
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Old 07-20-2006, 10:08 AM   #3
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Quote:
Originally Posted by Laterilus
Definitely worthwhile. I didn't buy one made, I just went to Wally World and picked up some Duracell NiMH rechargables and built my own. Yes, you lay it on its side and stand your receiver up on its end. It works just fine. I don't ever bother recharging my pack for a race day. It'll last all through practice, 3 quals, and a 15 min. main with no fade.

What about the extra weight of the batt pack ? .. its notorious ?


thanks,
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Old 07-20-2006, 10:36 AM   #4
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no it wouldnt be notorious...its just like using the little case with the 4 AAs. A little extra ounces or so i guess, but i dont think it will make a difference.
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Old 07-20-2006, 12:43 PM   #5
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If this was electric racing, that'd be one thing, but in 1/8 nitro.... You could put a lead brick under my 1/8 body and I probably wouldn't notice it. I don't think 5 AA's weigh that much more than the 5 2/3A cells. I certainly don't notice a handling difference between the two.
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Old 07-20-2006, 01:34 PM   #6
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The only person I have heard of noticing the difference (Chad Bradley) used the larger pack specifically for the weight. He liked the way the extra weight settled the car down in the rough. He was even sponsored by a company that makes LiPo rx packs.
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Old 07-20-2006, 06:06 PM   #7
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A little more weight is not always a bad thing.
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Old 07-20-2006, 08:36 PM   #8
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There's no argument it would be heavier than NiCad, but it gives you more time for other important things you might need to do on a busy race day, not to mention the much, much higher capacity it has.

Like Laterilus said, it can last the whole race. I have seen once too often racers cursing halfway through a race that they forgot to recharge their battery pack. Then there are also cases of people going around pleading to use a charger. You 'weight' the pros & cons & will find the pros is worth the extra weight. If you have some basic soldering knowledge, it will cost less than USD20 to make a 2,500mah(more than enough) pack yourself.
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Old 07-21-2006, 11:29 AM   #9
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Laterilus-
What did you use for bars, connectors? I want to make my own pack as well. I think Ive seen somewhere that someone makes a "mini" bar, just not sure who or where. Thx
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Old 07-22-2006, 07:56 AM   #10
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Use the same battery bars that the mini guys use to make their battery packs.
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Old 07-22-2006, 10:26 AM   #11
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I thoguht as much, just wasn't sure who makes them. It doesn't matter anyway though. I did some test fitting with AA Alkalines and the 5 cells wont fit in the Hyper 8 box with a Nomadio Rx
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Old 07-24-2006, 07:35 AM   #12
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Did you stand your receiver up on its end? That'll save you a ton of space.
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Old 07-24-2006, 08:35 AM   #13
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Yeah, I tried several positions. I finally did find one method that will work with a little finagling...Im not to sure what Ill do though, yet. I already have the LiPo Rx packs....1 @ 2000 MaH and 1 @ 1000 MaH. Don't want to waste the $ I spent on them. I am aware Novak, VXR, and HT Batteries all makes volt regualtors. Novaks is rated @ 3 amps, VXR's is @5 amps, and Im waiting on an answer from HTs customer service to find out what thier's is rated at.At 3 amps, Novak's simply is not strong enough to handle multiple digi servos. VXR's at 5 is a little better, but from what I have heard... 5 amps is still suspect. Im hoping HT's is more than 5 amps but we'll see.....
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Old 07-25-2006, 06:58 AM   #14
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For making small packs use the braid wire from Radio Shack. It is actually solder removal braid and can come in some very small sizes. We make small packs for a few of the Traxxas drivers. We use braid because the connections cannot become stressed in an offraod inviroment.

On our full size packs we do the same thing. Shoe Goo in a jig. Grind the cells slightly. Tinn the cell with a little solder. Tin the ends of your small precut braids using a heatsink plier so the whole thing don't wick up the solder. Get your iron hot and wet. Apply quickly.

Now you have a pack that can flex a little and you don't have to worry about connections.

In full sized packs it is narrower, lighter and flexible. I saw a guy eject a pack out of his sedan at 30+ on concrete. It was dragging and hit the curb hard. Never lost connection but destroyed the pack and the car.

Hope this helps.
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Old 07-25-2006, 06:59 AM   #15
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BTW - In my 1/8th scale buggy. The car balances on center points with half a tank of gas when I have 5 AAs strapped in.
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