I've owned a 20A charger/discharger for almost 1.5 years, but the truth is i've used 20A discharge less than 30 time i think.
It's not practical enough to match every single cell I have, and it's not worth it to cycle a whole pack because it reduces the life of a pack by 1 cycle(you only get that many cycles per pack)
I only use the discharge function on all the chargers to finish up the pack if for some reason I couldn't run the pack to almost dumping on the track. For this purpose, 10A is way more than enough.
After that it's to the tray.
I'm agree your opinion about the discharge theory .
Don't always discharge your packs over 10amp , I think Cell master discharge function is use for discharge the remain energy of the pack after racing, because CTX 3 step mode is no any cut off detect in first step, it may cause over charge to kill your pack.
There is my cell management in research for couple years.
just benefit for GP3300
First, discharge your pack cut off at 0.9v per cell (under 10A)
Second step, place your pack to discharge tray as "MM-zero volt" for one day, then leave from the tray and charge the pack immediately . Then, part charge the pack cut off around 500mah capacity until the next racing.
In the next racing just only discharge cut off at 5.4v 10A (6cell pack), and then charge at 5A linear mode, you can feeling punch and long lasting.
Thanks
Anthony
go2best
Last edited by G2B Anthony; 12-17-2004 at 05:55 PM.
Thanks for answering my question Ryan! That's exactly what I wanted to know Great to have you on the board supporting the product.
Quote:
Originally posted by Ryan Lee Many people want to discharge their battery at high rate over 20A, what do they want to see? AVERAGE VOLT.
But I don't think higher average V always means "Punch".
Each cell has different discharging characteristics, so you can't say "same Average V cells mean same charateristics"
If you discharge one battery pack with different dishcharging amp,
you'll see capacity is almost same but average volt changing.
That's why many people want buying high amp dischager.
According to our test, Internel resistance is muchmore reliable.
Lower IR shows always much punch.
Cell master shows very accurate IR.
Low IR means "the voltage recovering speed is very fast"
If two cell's IR are same, that means both has same volt recovering speed.
When I cycle my packs, now I see only capacity and IR.
We doubled the original IR value for showing much differences between each cell.
also I don't have to kill my battery packs with high amp discharging for just seeing "data"
CM's 10A dishcharging never kill your battery, show right capacity and how much punch your pack has with "IR".
If we make CM as 30A discharger, the size will be triple!
Measuring IR directly from battery is technically impossible.
Discharging stops very short time after 2minutes from discharging starts, CM looks for the difference between the voltage during discharging and released . then calculate IR by our own way.
If you want to compare more than two battery packs,
Measuring IR should be tested under same condition,
I recommend
4.5A charge(fully), 4~6mV
1min cool down
10A discharge
(Explanation by Korean is better, I'm not sure above could be helpful? LOL)
Quote:
Originally posted by nnick Hello,
One question regarding IR. How does the charger gives that info? Doing calculaion or actaully measure it?
Why charge 4.5? I always charge 5 (exept the times I'm in a hurry where I charge with 6A)
Something else, I just recieved the charger (Post Office delayed me 1 week gkrrr) and as I was looking it I noticed on the left side two parallel holes and in one there are some pins. What are those for?
Also, on the right side there is a socket for connecting fan. Since, I have a number of fans already will it be ok to use any of the ones I have? What are the characteristcs of that socket?
4.5A or 5.0 anything is ok, the important is the refenrence.
You need to keep same charging ampere always.
Left side's terminals for programing(burning IC),
Right side' secket is for Muchmore's fan stand controlled by temp sensor come with CM or Battery warmer for Winter.
This is our exclusive function. Fan acts automaically from target temperature, so battery never gets hot during charge.
I recommend to use only Muchmore's fan stand or Battery warmer because it allows below 500mA.(0.5A).
Ryan
Quote:
Originally posted by nnick
Sounds resonable.
Why charge 4.5? I always charge 5 (exept the times I'm in a hurry where I charge with 6A)
Something else, I just recieved the charger (Post Office delayed me 1 week gkrrr) and as I was looking it I noticed on the left side two parallel holes and in one there are some pins. What are those for?
Also, on the right side there is a socket for connecting fan. Since, I have a number of fans already will it be ok to use any of the ones I have? What are the characteristcs of that socket?
Originally posted by Cole Trickle How's your experience with the power master? Voltage stability during big races, protection circuits, overall durability?
Hi Cole,
I am one of those guys who sticks to a brand once I fell in love with the first thing I got from them. I got the Motor Master and a week later my power supply fried. (not because of the motor master !)
I thought at first that 125 € for a power supply was a lot, but I have been using my Power Master for over 6 months now and I have never ever had a single problem with it. I convinced a lot of guys at the club to get one as well and at lunchbreaks during races we always try and see what else we can plug into the Power Master. For example : two chargers (one cell master and one pulsar competition) charging at 6,5 amps each, the motor master doing break in at 4 V with 6 amps draw, my tyre warmers and a 12 v cooling fan and the Power Master just kept going and going and going like a duracell bunny...
I admit, it wasn't easy to get all the alligator clips locked at the same time but the experiment was a succes !
Anyway, if you are looking for a power supply you can trust, that is small, lightweight and stable as the Grand Canyon, go get the Power Master.
And no, I am not affiliated to them in any way, I just like their products and as you have already seen, they have their own product specialist on the board and there aren't that many companies that do this.
For every other question on Much More products, let me know, I have all of them, but please don't tell my wife
Originally posted by MrEvoIII (...)I admit, it wasn't easy to get all the alligator clips locked at the same time but the experiment was a succes !(...)
Jan from Belgium
Originally posted by nnick MrEvoIII can you tell us what is the reason you think the power supply failed?
Thank you
Nick
Probably coz he did this to his power supply?
Quote:
at lunchbreaks during races we always try and see what else we can plug into the Power Master. For example : two chargers (one cell master and one pulsar competition) charging at 6,5 amps each, the motor master doing break in at 4 V with 6 amps draw, my tyre warmers and a 12 v cooling fan and the Power Master just kept going and going and going like a duracell bunny...
I read this as the old PS failed that is why MrEvoIII bought the new power master.
MrEvoIII - is that correct?
thank you,
Keith.
Yes, that is correct, my old one was from BMI I believe, only 10 amps, I don't know what happened, I never charge over 6 amps anyway and at that time all I had was a Pulsar Competition and the motor master and I wasn't even using them at the same time when the PS fried. Anyway, I haven't had it since I have the Power Master and yes indeed, a Power Station might come in handy one day...
And if anyone is looking for Much More equipment that is out of stock, there is a shop in Belgium that still has some Cell Masters and Power Masters, the site is in English and you can buy on-line
Great to have you on the board supporting the product.
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