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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › NiMH rx packs - are they safe or not.
07-17-2006 09:31 PM  14 years ago
DS 8717

rrProfessor

Here wishing i was somewhere else

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you could also look at resistance as trying to force the same amount of water through a 1/4" hose and then through a 1" hose. Or you could use a wire passing the same amount of current through a wire thats too thin and a lot of the energy is consumed as heat.DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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07-18-2006 09:14 AM  14 years ago
nivlek

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Norfolk England

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I would have to say that ChickenX has probably gained more EXPERIENCE in his 6 months
That still doesn't alter the fact that he has only been using the battery pack for a maximum of six months . Using one or two packs for six months proves nothing ! A pack has a cycle life of several hundred cycles - how many complete cycles has a six month old pack gone through ?
At the end of the day , it gets dark .
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07-18-2006 09:55 AM  14 years ago
Yug

rrMaster

UK. Herts

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NiMH rx packs - are they safe or not
Yes, provided you bear in mind that the AA packs are probably best not used with digitals; for that use Sub C or C cells due to the internal resistance. I've never ever had a failure or problem with any of these packs and even when I first started using digitals with AA cells.
The only time a C cell pack is dangerous is when you drop it on your toe.
Vegetable rights and Peace
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07-18-2006 11:43 AM  14 years ago
Helinutnz

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below 42 South

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I use the 1950 FAUP NiMh cells in the Freya (admittedly 2 packs in parallel) but they are 4.5 Mohms internal resistance. I'd have no worries running one pack on a 50 size. I Only run them to 70% capacity. (1365 mah) At 350 mah per flight thats approx 4 flights per charge for one battery if it were on a 50. Not great flight time. But the issue is that they can provide the power for digitals easily. One thing to remember is that they have a lower voltage than a freshly charged nicad say 5.4 volts versus 5.6 volts. This drops to 5.2 volts on the freya but sits there for ages and when they are getting depleted they go down all of a sudden. The nicad drops off more slowly.
As long as you know the operating characteristics of the cell you are using then no worries. And as far as open circuit on failure...yes that is how they fail but the failure rate is so low these days I wouldn't even consider it an issue.

I would however be careful of the potential voltage drop of a 2700 NIMH battery with internal resistance of 20 mohms per cell. I personally wouldn't use one. If you double up on the batteries then your resistance drops by half but the weight is more than you would want for a 50. Then you'd get a li-ion or something.
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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › NiMH rx packs - are they safe or not.
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