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Old 12-15-2004, 01:10 AM   #121
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Quote:
Originally posted by nnick
Could you please clarify sometrhing for me?

You had a battery fully charged and you charged it again but the charger didn't detect it was charged and that resulted your battery to melt. Right?

Where you using temp cut off or peak cut off?
Is there a repeak function on its own on the charger that you should use instead??

Thank you

Nick
yes.
I was using the CTX charge mode where for 2000mAh, the peak detection was locked. During then the pack had too much and just melted. There was no peak detection.
I also thought that the temp cut was off, but as it was clarified earlier by Ryan, it WAS supposed to stop the charging.

I didn't know the pack was fully charged, else I would've surely used repeaking mode.
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Old 12-16-2004, 05:58 AM   #122
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Default Re: Cut off temperature

Quote:
Originally posted by Ryan Lee
Set Cut off temperature for "Safety"

In Summer,(30C~35C)
Intellect3600, GP3300 52~55deg
Sanyo 3600 40~43
Panasonic Ultra metal 43~45

which works fine but will depend on your location.

Make sure your temp sensor meets on cell's surface.


Ryan
Hello Ryan

I really appreciate to see a company reprensative talking about charging here - there so many myths and ghost, when it's about charging.

Now, I'm curious about where the above temperatures came from?

Do you have the same numbers, when ambient temperature is around 18-25 degrees celsius?

Also, what about GP cells? I tend to say most people are using GP's...

Thanks.
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Old 12-16-2004, 06:07 AM   #123
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Default GP data sheet

Sligthly off-topic, this aint specific for the Cell Master.... But here goes:

I found these recommendations from GP:

http://www.gpbatteries.com.hk/pic/300schR%20rev1.pdf

Seems to be on the safe side.... Charge rate: 0,5-1,0C (max 3 amps). I believe TCO is Temperature Cut Off, right? If so, they recommend to stop charging, when the batts reach 40-45 deg. C.

But they also seem to recommend using delta-temperature cut off. Why dont any charger offer that? That would work independant on varying ambient temperature...

And for those racing in the cold: Be aware, that GP only recommend fast charge, while the temperature is ABOVE 10 deg. celsius...
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Old 12-16-2004, 06:20 AM   #124
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How's your experience with the power master? Voltage stability during big races, protection circuits, overall durability?
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Old 12-16-2004, 06:23 AM   #125
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In general Ryan, you recommend usign the temp cut off instead of peak detect right?

Why is that?

Nick
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Last edited by nnick; 12-16-2004 at 06:29 AM.
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Old 12-16-2004, 06:24 AM   #126
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Cole, I'll get to you as soon as I got mine!

Nick
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Old 12-16-2004, 06:32 AM   #127
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Quote:
Originally posted by nnick
In general you recommend usign the temp cut off instead of peak detect right?

Why is that?

Nick
I'm a little confused here, are you asking me?

My personal point of view, is that temperature cut off is good (fixed temp cut off), since it never false peak and always cut off at the same temperature. While peak detect gives varying results, if the ambient temperature differ from charge to charge. Not to mention Lee82GX's example of charging a already charged pack WITH peack detect locked out...

But forget to mount that temp probe....

So I find that temp cut off cant stand alone, it should be used in conjunction with delta cut off. It might introduce a false peak from time to time, but I prefer that over cooking my expensive packs.

Please keep in mind, that I dont have a charger with temp cut off. Why I choosed the charger I have? That's another story... But I do complement my charger with a temp gun and some extra work

That's my approach to this. But someone else might have a usefull input...
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Last edited by Cole Trickle; 12-16-2004 at 06:37 AM.
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Old 12-16-2004, 06:33 AM   #128
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Quote:
Originally posted by nnick
Cole, I'll get to you as soon as I got mine!

Nick
Thanks. It's great to have helpfull fellow racers around the world...
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Old 12-16-2004, 06:38 AM   #129
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I changed my question to address to Ryan!

I personally don't use temp cyt off since ambient temperature can affect charge.
Protrak has the best system for measuring temperature since it has 4 probes instead of 1 like most chargers.
For the past 2 1/2 years I own a Schulze Electronics chanrger and never used the temperature probe! I expect to do the same with much more!

Most likely I'll have both peak and temp cut off and whatever stop s the charge first!

I should get it this week, and as soon as I play with it I'll ket everyone now my thoughts!

Nick

Quote:
Originally posted by Cole Trickle
I'm a little confused here, are you asking me?

My personal point of view, is that temperature cut off is good (fixed temp cut off), since it never false peak and always cut off at the same temperature. While peak detect gives varying results, if the ambient temperature differ from charge to charge. Not to mention Lee82GX's example of charging a already charged pack WITH peack detect locked out...

But forget to mount that temp probe....

So I find that temp cut off cant stand alone.

That's my approach to this. But someone else might have a usefull input...
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Old 12-16-2004, 06:49 AM   #130
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Quote:
Originally posted by nnick
I personally don't use temp cyt off since ambient temperature can affect charge.
Can you explain in which manner? Would the use of delta temperature cut off solve these issues?
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Old 12-16-2004, 07:15 AM   #131
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Quote:
Originally posted by Cole Trickle
Can you explain in which manner? Would the use of delta temperature cut off solve these issues?
I think that ambient temperature can and will affect cut off.
If its 40 degrees celcium at the ambient the battery will reach sooner the designated 45 degrees so will stop the charge leaving your battery not fully charged. The opposite will happen if it's very cold

My batteries need 30-33 minutes to charge or 40-42 if I have equalized them prior charging. I check the time to be sure that everything is ok!

Nick
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Old 12-16-2004, 07:45 AM   #132
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Quote:
Originally posted by nnick
I think that ambient temperature can and will affect cut off.
If its 40 degrees celcium at the ambient the battery will reach sooner the designated 45 degrees so will stop the charge leaving your battery not fully charged. The opposite will happen if it's very cold

My batteries need 30-33 minutes to charge or 40-42 if I have equalized them prior charging. I check the time to be sure that everything is ok!

Nick
That's a very good point ! Sounds like that fixed temperature cut off is only meant as an extra safety feature....
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Old 12-16-2004, 07:51 AM   #133
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Exactly, that's why I use mainly peak and secondary temp at 45degrees

But this is only me!

Nick
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Old 12-16-2004, 08:04 AM   #134
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Hi All,

Pro Trak's temp cut off is backed by a setable safety delta for extra security. Also the lockout Mah is only activated when full discharge before charge is used ensuring that overcharge cannot occur. I have been using this for a while now and it seems to work very well.

Chris.
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Old 12-16-2004, 10:32 AM   #135
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when you use temp cut, it's better to let it be a 'safety' thing. I find that in my ambient temperatures, the cells which are trayed will peak around 40-42C. Usually 41.4C . I don't know why, but this number appears quite often.
Setting it at 45C will be a safe point for the batteries.

I've been told that even in my case with the peak detection locked out, the charger should have cut at 65C. I don't know why it didnt as i wasnt monitoring the packs then( my mistake).
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