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Old May 15, 2001, 07:37 AM
Registered User
Millarville,Alberta,Canada
Joined Jun 2000
544 Posts
Using Lite Stick with 9v NiMh Battery

Hi
I got 2 new 9v Energizer Hi-Energy NiMh batterys.Put them on a charger for 12hrs at 14ma charge rate. My voltage read ~8.4volts.Then I put 2 in parallel and tried them on a Lite Stick ran for 1min.Other folks that use the Ray O Vac ones I would like to know what is your voltage reading after a full charge,People with Lite Sticks say they run for 8mins?

Thks
Wayne
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Old May 15, 2001, 09:28 AM
"Simplify, then add lightness"
Raleigh,NC
Joined Nov 2000
2,701 Posts
Wayne,
I am pretty sure that the energizer NIMH 9v has only 6 cells which is not enough to power a lite stik. The rayovac 9v has 7 cells. I think the fully charged no-load voltage on the rayovac is around 10 volts. The rayovac package says 8.4v on it, and i believe the energizer package says 7.2v. I only get about 5 minutes on my lite stik with the rayovac's, but i tend to fly full throttle most of the time.

Jeff
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Old May 15, 2001, 10:34 AM
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Millarville,Alberta,Canada
Joined Jun 2000
544 Posts
Hi Jeff

Thanks makes sense, when I look at back on battery package it says 7.2v/150mha, I guess the current is there but not the voltage, I got these at Wallmart in Canada.

Thks
Wayne
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Old May 15, 2001, 01:52 PM
"Simplify, then add lightness"
Raleigh,NC
Joined Nov 2000
2,701 Posts
I just use one Rayovac 9v NIMH at a time, and have plenty of power, and my lite stik is pretty heavy with lots of repairs. What charger are you using? Some other brands of 9v chargers are designed to charge the 7.2v NIMH and won't fully charge the 8.4v Rayovac. Are your connections good? What battery do you normally use in your LS? The performance should be comparable to any other 7-cell NIMH, better than a 6-cell NICAD, and worse than a 7-cell NICAD. Did the package on your Rayovac say 8.4 volts? I think rayovac only makes the 8.4 NIMH, but I am not sure.

Jeff
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Old May 15, 2001, 02:53 PM
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hI CTAMBOIA. wHY ARE YOU UNDERPROPPING THE d SYSTEM WITH THE 10-4.7? OOPS CAPLOCK. Is this on a litestik? I would speculate that the D uses a 11 at the least and could push a 12 nicely. You are robbing yourself of available thrust IMHO. Best Regards
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Old May 16, 2001, 12:06 AM
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Spokane WA
Joined May 2001
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I have a Rayovac 9V NIMH. I am not sure what I am doing wrong, but my 9V is very weak. Can barely taxi my Lite Stik around. I have let it discharge and charge overnight. Am I supposed to put TWO 9V in parallel to get the power I need?

bugs
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Old May 16, 2001, 12:23 AM
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Old May 16, 2001, 09:55 AM
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Millarville,Alberta,Canada
Joined Jun 2000
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I found the specs on the 9v battery at Rayovac site.It is a 8.4v cell. I took back my Energizer ones which are 7.2v and also the other bands are 7.2v. So be warned. still trying to find them here. Going to try 2 in parallel if I get them. http://navigation.helper.realnames.c...0&uid=30115922

Wayne
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Old May 17, 2001, 01:13 AM
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Toronto, Ontario, Canada
Joined Oct 2000
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A while back I was talking to a salesperson in Radio Shack, and he said that their Ni-mh 9V cells were 8.4V. If I remember correctly, he also said that their branded batteries are also made by Energizer, go figure!

Check them out at RS, since I know that the Wal-Mart's in Canada don't usually have the 9V Ray-O-Vac's in stock. The RS cells should work nicely. The other problem is that the nice Ray-O-Vac charger isn't available either, but again, RS sells something which might interest you. Just check the 9V packaging to make sure you're getting the 8.4V cell.

Normally RS is the LAST place I go to for stuff, but in this case, they have something worth going there for.

Phil.
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Old May 17, 2001, 11:47 AM
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Houston, Texas
Joined Mar 2001
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Wayne,

I checked out your link. The NiMH 9V battery is rated at 8.4 volts and only 150 MAH. With two 9V's in parallel, that's 300 MAH, right? I made a pack out of 8 AAA NiMH from Radio Shack, and that has 9.6 volts and 600 MAH. I must be missing something here, because the AAA's seem like they have more performance...?

-Aikens
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Old May 17, 2001, 02:18 PM
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Toronto, Ontario, Canada
Joined Oct 2000
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Aikens,

Actually it makes sense. The 600mAh cells can put out more current, so the performance should be better.

Besides, you're comparing a pack at 8.4V, with one at 9.6V. Apples to oranges really.

The only limiting factor may be the weight of the respective packs. Have you thrown them on a scale?

Phil.
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Old May 17, 2001, 05:41 PM
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Houston, Texas
Joined Mar 2001
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Phil,

My home-made pack (and boy it's ugly) of 8 AAA NiMH weights 3.8 oz. With my Speed 280 geared 4:1, it initially draws 3.3 amps. It's not much power, but it works.

I wonder how much two 9V NiMH weight?

-Aikens
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Old May 17, 2001, 07:40 PM
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Austin, Texas USA
Joined Mar 2001
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We sell some NIMH packs put together for these size planes. They are 8 cell Sanyo AAA 720mah NIMH and sell for $24. They weigh 3.6 ounces for reference. These Sanyo NIMH can really put out good voltage numbers without dropping voltage like I figure a 9 volt size (150mah) battery would. Just throwing some numbers out for you guys.

Shawn
eflightpower.com
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Old May 17, 2001, 07:46 PM
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Ithaca, NY USA
Joined Mar 2001
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I've been using 700mAH AAA NiMH cells on my GWS A powered DuskStik with great results so I would think that those 720mAH Sanyos would be just the ticket. I got a 40 minute flight out of my extended wing DuskStik the other day on that pack with careful throttle management. Your mileage may vary.

Doug
www.geocities.com/duskstik
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Old May 19, 2001, 10:59 PM
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Victoria, BC, Canada
Joined Apr 2001
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The Energizer 9V is made by SAFT in Germany and can't provide much current. The Rayovac and Radio Shack NiMH 9V is made by Gold Peak in China. You can find them branded as GP in battery and hardware stores in Canada in both 6 and 7 cell versions.
I made up an 8 cell pack of GP 650 mAh AAA NiMH for Speed 280 (only 3 oz.) Its a little weak for S280 but lasts half an hour on a Lite Stik.
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