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05-05-2005 03:20 PM  13 years agoPost 1
Just Starting

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UK

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I recently got a secong hand rd6000 and decieded to change the tx and rx ni cads before installing in my raptor. This i did and then put the radio equipment together to check it all worked fine. It did......
I charged both batteries but was then unable to put it all together because of work, this was about a month ago. Yesterday i got it all together and fitted it to the heli, conected it all ok switched it on and nothing. The tx battery is still fully charged but the rx battery reads in the red on my battery checker. So i charged the rx battery overnight but this hasnt made any difference. Does anybody have any ideas. I changed the charger but this hasnt made any difference either.

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05-05-2005 03:57 PM  13 years agoPost 2
Leif

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USA

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Yes. Buy a new battery.

I would NEVER trust the batteries in a second-hand radio setup.

Leif

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05-05-2005 04:08 PM  13 years agoPost 3
Gary

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Crosby, Texas

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Definitely buy new batteries.

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05-05-2005 04:51 PM  13 years agoPost 4
MJWS

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Airdrie, AB - Canada

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Yep. Easy answer is to get a new pack.

But there isn't a real reason to be afraid of used packs. You just need a good charger to cycle them and let you know exactly what is going on with them.

A good field charger like the triton, ice, astroflight 110 will tell you the exact state of the batteries. You can cycle them and see how much usable capacity is left. One of the other cyclers like the futaba br2000 would work excellent as well. It's a great tool to have in the aresenal. But they DO cost money.

Used radio equipment is always a crap shoot. Packs are cheap. So get a new one as insurance. When you have better tools, then test your used stuff and see if it is worth keeping.

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05-05-2005 11:00 PM  13 years agoPost 5
Leif

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USA

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there isn't a real reason to be afraid of used packs.
Not "afraid", but that doesn't mean I'll "trust" them. Just because a battery pack can go through a proper charge/discharge cycle doesn't tell you anything about its past.

I like to know whether my packs have been crashed or overcharged, or run completely flat or dropped out of a high-speed moving vehicle. With a used pack, you simply don't know what it's been through. A seemingly good pack can have hidden damage that will only show up under vibration conditions. For a RX pack worth $20 to $30, I would not risk my $600+ heli.

Leif

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05-06-2005 02:07 AM  13 years agoPost 6
MJWS

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Airdrie, AB - Canada

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Your NEW pack can have damage that only shows up under vibration. Ever had a hard landing. Did you chuck the pack? Ever crashed? Did you chuck every pack? Of course not. You tested it. It was fine. You moved on.

If a pack will cycle to capacity and discharge correctly its history is not relevant. Batteries aren't 'magic'. They don't hold a grudge. Each time they are mistreated their discharge curve is affected. If they are abused they will not work as new. Period.

Paranoia because someone else used it or touched it is irrational. Buying a new pack becuase you believe one is faulty is good risk management.

Mike

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05-06-2005 02:27 AM  13 years agoPost 7
Leif

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USA

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What about inter-cell connectors that have ripped loose and are just giving you surface-contact? Same with wires that might be on their last thread when the battery was ejected from a crashed model. These potential issues can be hidden, and you would not necessarily see these as problems until too late.

When I have a crash that might have physically damaged the pack, I will typically replace it. I'm not talking about a hard landing here, but the full-power nose-first obliteration kind of crash. My point is, when it's YOUR pack, you know the pack's history and know what to look for besides charge/discharge behavior.

No, batteries aren't magic. However, battery PACKS have more to them than just the cells.

Leif

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05-06-2005 02:47 AM  13 years agoPost 8
MJWS

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Airdrie, AB - Canada

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Lief,

My hearts not in this one man. I only take exception to FUD that presupposes all used packs are bad and must be replaced. Both you and I can think of a dozen guys we would not hesitate to buy a receiver pack from.

The risk from 'hidden dangers' in a pack is minimal at best. To rip wires and inter-connects takes force which leaves dents, marks, rips etc. These aren't tough to spot. Discharge the pack with significant current and if there are wiring faults they will manifest. If it is safe at 10A on my bench and looks pristine. It'll do 5A in my heli without causing me to pucker.

Some people can't chuck their packs after every little bump. Some people have to run used gear. It is reasonable and practical for them to be diligent and cautious.... but to proceed.

As I said, Hearts not in this one. I don't do used electronics either. But I have friends that benefit nicely from hand me downs and deals on ebay.

Regards,

Mike

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05-06-2005 03:12 AM  13 years agoPost 9
Leif

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USA

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Yep. I think we've discussed it to death.

Leif

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05-06-2005 03:50 AM  13 years agoPost 10
c140flyer

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Rockport,MA USA

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Hey Guys,
If you read his post carefully, you'll see that the first thing he did was change packs. He had problems with a NEW receiver pack.This makes this whole "discussion" irrelevant.
My suggestion is to cycle the pack a few times, and if it doesn't come up to snuff, return the receiver pack from where it was bought if possible.
I thought I was having problems with a pack I bought from Hangtimes and the owner of the company talked me through some troubleshooting which revealed that the battery was OK. He had offered to replace it if I wasn't satisfied.

Larry

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05-06-2005 07:03 AM  13 years agoPost 11
MJWS

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Airdrie, AB - Canada

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I think everyone reading is thinking the first 'change' is a typo. It was interpreted as 'charge'.

If you read sentence two... he refers to the 'change' as something he did. Not 'I bought new packs, charged them up, they worked... now they don't'

My money is on the prior responses being correct.

Dunno..... He'll have to tell us.

Mike

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05-06-2005 12:41 PM  13 years agoPost 12
crowfly

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Pleasant View, TN U.S.A.

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I think if there is the slightest hint of a potential problem lurking in the background, he should sell the battery to someone that he doesn't like. That way He can recover a portion of the cost of the new battery, hence making it eaisier to justify. LIGHT THEM TORCHES

If God had meant for man to fly, he would have given him more money

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05-06-2005 04:37 PM  13 years agoPost 13
c140flyer

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Rockport,MA USA

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Hi MWJS,
You might be right. He should come back and clearify weather he meant "change" or" charge".

Larry

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05-06-2005 07:54 PM  13 years agoPost 14
MJWS

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Airdrie, AB - Canada

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He's too busy flying while we're dickin' around on here.

Mike

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05-07-2005 09:34 AM  13 years agoPost 15
Just Starting

rrNovice

UK

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I did get NEW batteries. Before I installed all of the servos they worked fine, but now with everything installed nothing works. Could the receiver or crystal be faulty.

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05-07-2005 12:44 PM  13 years agoPost 16
Leif

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USA

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Sorry, most of us seem to have missed that these were new batteries (funny how you read what you think it says, rather than what it really says).

You indicated that the battery pack monitor reads low voltage, and that charging it doesn't improve this. Either the pack is faulty or you are draining an extremely high current from the pack.

When you switch your RX on, does the battery pack get hot? A bad or binding servo can draw a lot of current. Did you already connect linkages without checking for the servo centering? That can also bind the servos. Improper wiring (connector plugged in wrong) or damaged servo leads (shorted) can also produce this.

Of course, even new battery packs CAN be bad. If this is the case, you can simply return it for a replacement.

Leif

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