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HelicopterMain Discussion › Fromeco-Peerless
09-16-2007 08:12 PM  10 years agoPost 21
Ace Dude

rrProfessor

USA

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Funny, I see that same voltage posted here and resulted in a crash.
At that voltage with 15 minutes of flying with all digital servos, 7.5 volts CURRENT is definitely not up to par.
The only way to properly measure the voltage is under load. Fromeco recommends you stop flying at 7.0v under a 1A load. I routinely fly to 7.1v under a 1A load and have never had a problem.

  

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09-16-2007 08:46 PM  10 years agoPost 22
Qrrambero

rrKey Veteran

San Francisco / Bay Area

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Thanks for all the information.
Here is the last one. I put the battery in my Orbit Charger and it read the two batteries (Pack) I was surprise to see that I had 7.4 I disconnected and I used the Fromeco checker and I had 7.4
How it goes from zero to 7.4?
Well a friend started to tap the battery with his fingers and unbelievable it when dead again.
At lease I know there is something wrong inside and I do not want to find out. I will put my Nicad back and end of the history.

Ae

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09-16-2007 09:04 PM  10 years agoPost 23
Barney

rrKey Veteran

Inverness Scotland

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Sorry about the Delay had to be a taxi for the kids.

OK Ians battery MAY have been accidently 'Discharged' by mistake but cannot yet confirm this...

Anyways when he got home he plugged it all back in and got about 40-50 secs then it all shut down again.
So he then stuck it back on his charger and it is charging as we speak...he's put in 1600+ and it's up to something like 7.8v currently

Last time out he had 5 flights and he remembers reading 1600 odds Mha when he left this morning to go flying. He is unsure whether he had accidently selected d/i?...This may explain the problem.

The reason my charger never picked up the batteries current voltage was the leads were reversed for charging my DX7 and if you do a battery Voltage check only does not indicate any reversed polarity

So I have a couple questions.
Does a Peerless have a safety protection circuit on the PCB?

Or does the Arizona cut out at a low voltage and the lights go out?

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09-16-2007 09:09 PM  10 years agoPost 24
Obiwan

rrVeteran

Sevilla, Spain

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Yes it has happened to us 3 times with packs from different batches

We believe we traced down the problem and it is due to low current charging. We used to charge the batteries below 1C and it is like if charging below 1C drains the battery, don't think it makes sense but this is what we finally determined.

Now we charge them always at 2Amps minimum and so far so good for almost 2 years.

Best way to predict the future, is to Invent it.

FORMERLY KNOWN AS ForrestGump

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09-16-2007 09:23 PM  10 years agoPost 25
raptorheli2

rrElite Veteran

rip off britain and no changing it

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barney, if it's taken 1600mah's and it's only at that voltage then he has all but drained the pack.

as for the charging, when i think of it someone in my club ruined a fromeco by charging it at like 200mah's but it never took a complete dump.

cheers


www.waterfoothelis.com

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09-16-2007 10:20 PM  10 years agoPost 26
Barney

rrKey Veteran

Inverness Scotland

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Yep, it does look like he's run a discharge cycle.

It's a Chameleon..and he just can't recall for certain whether it displayed d or i which I believe equates to charge/Discharge. (Iv'e never played with one)

If the battery had shorted we would at the very least had a very hot battery..or seen some kind of heat damage.

The only other thing is a poor/intermittent connection but that looks highly unlikely due to the batteries low but not fully discharged Voltage

For certain we at least know his charger was set on the 7.4v Lion setting so worst sceniaro is it's discharged. As for the other damage we are just glad it is limited to the heli only.

In hindsight a load check before flying would have picked the problem up.

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09-17-2007 12:28 AM  10 years agoPost 27
Stu.

rrVeteran

Abrakebabra Kebab shop

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It's a Chameleon
the LiIon setting on that charges to 7.2v a cell. Doesnt charge at all. The result is that you might set a 4amp charge, but it never gets much above 200-300 mA

If in doubt use the LiPo setting which charges at 7.4v. (as per fromecos site)

Stu

www.waterfoothelis.com

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09-17-2007 12:50 PM  10 years agoPost 28
Barney

rrKey Veteran

Inverness Scotland

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It looks like it's been a charger mistake on this occasion as the battery took 2236Mha to 8.42v....

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09-17-2007 03:40 PM  10 years agoPost 29
Ace Dude

rrProfessor

USA

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the LiIon setting on that charges to 7.2v a cell. Doesnt charge at all. The result is that you might set a 4amp charge, but it never gets much above 200-300 mA
You're going to have some serious problems if you charge to 7.2v/cell as stated above.

The correct charge voltage is 4.2v/cell using a cc/cv algorithm. Older LiIon cells were 4.1v/cell, thus some older chargers use 4.1v/cell in their LiIon program. You should use the LiPo program or ensure your charger's LiIon program charges to 4.2v/cell. The better chargers allow you to specify the terminal voltage. My Orbit Pocketlader defaults to 4.1v/cell for the LiIon program however you can configure it to 4.2v/cell in the chargers settings.

Whether you're using a 2 cell or 4 cell Fromeco back they are both wired as 2S and should be charged as a 2S packs. The two cells packs are wired as 2S1P and the four cell packs are wired as 2S2P.

  

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09-17-2007 11:33 PM  10 years agoPost 30
Barney

rrKey Veteran

Inverness Scotland

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UGGHHH! The batteries voltage suddeny collapsed again when being tested...Houston...We have a problem

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09-17-2007 11:40 PM  10 years agoPost 31
Ace Dude

rrProfessor

USA

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One definition of insanity is trying the same thing over and over and expecting a different result. The best this to do is send it in to the manufacturer.

  

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