weird 4200s
01-22-2008 | 12:35 PM
#1
Thread Starter
Tech Apprentice
Joined: Jun 2007
Posts: 60
weird 4200s
.I was racing on friday and noticed one of my 4200 packs was just very slooooow. i thought nothing of it and diceded to cycle it. i dischaged it down to 5.4v and was about to put it on my equalising tray wen i noteced that 1 cell was realy hot. so i unsoldered the cell and i cannot see anything wrong with it
my other pack of 4200s i thought id better check aswell so i discarged that down to 5.4v then put it on my tray. i noticed 1 of the lights didnt come on so i checked the voltage and it read 0.00 so i tryed to put some charge into the 1 cell (setting my charger to 1 cell) and it just wouldnt charge.
does anyone now what is wrong with these cells or how i can save them or am i doing something wrong.
i charge them on a much more cell master at 5A (5.5 if im in a hurry) with 10 peak and 4800 cutoff.
lately though i have been puttinbg them on step charge
step1 5.0A till 800 Mah step 2 till 800 then peak charge at 5.5a with 10 peak
thanks in advance
my other pack of 4200s i thought id better check aswell so i discarged that down to 5.4v then put it on my tray. i noticed 1 of the lights didnt come on so i checked the voltage and it read 0.00 so i tryed to put some charge into the 1 cell (setting my charger to 1 cell) and it just wouldnt charge.
does anyone now what is wrong with these cells or how i can save them or am i doing something wrong.
i charge them on a much more cell master at 5A (5.5 if im in a hurry) with 10 peak and 4800 cutoff.
lately though i have been puttinbg them on step charge
step1 5.0A till 800 Mah step 2 till 800 then peak charge at 5.5a with 10 peak
thanks in advance
01-22-2008 | 06:34 PM
#2
If,as your signature suggests, they're Intellects, I wouldn't bother about fixing the packs, they're known to be unreliable and yours definitely is not an isolated incident. Be thankful they never exploded, bin them and go buy some more reliable batteries such as EastPowers.
01-23-2008 | 12:20 AM
#4
may I know what do you mean by 10 peak ? I assume 10mv for peak detect ...
For step charge on cell master, I always use 3mv as peak (I think it means 3mv per cell), for 6cell pack, this is a total of 18mv delta for peak detection.
On the other hand, I am also suffering from the old IB4200 WC cells ... mine are 1 year old and have been well taken care of in the past. Lately, they just tried to "retire" cell by cell. I remove some cells from packs, keep the rest for spare. From original 6 packs of 6cell packs, I now down to 4 packs of 5cell and couple of single cells as spare ...
I charge them at step charge on cell master, 6A for the first 2800mah, rest for 20mah at 0.2A, and continue to charge at 5A, delta 3mV, max 4900mah, always with cooling fans when charging.
Hope this helps.
For step charge on cell master, I always use 3mv as peak (I think it means 3mv per cell), for 6cell pack, this is a total of 18mv delta for peak detection.
On the other hand, I am also suffering from the old IB4200 WC cells ... mine are 1 year old and have been well taken care of in the past. Lately, they just tried to "retire" cell by cell. I remove some cells from packs, keep the rest for spare. From original 6 packs of 6cell packs, I now down to 4 packs of 5cell and couple of single cells as spare ...
I charge them at step charge on cell master, 6A for the first 2800mah, rest for 20mah at 0.2A, and continue to charge at 5A, delta 3mV, max 4900mah, always with cooling fans when charging.
Hope this helps.
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