Ive been away at the nats and finally got home last night.
See there has been lots of questions asked and assumptions made.
For this weeken i had 2 cell failures and both where IB4200.
First one was the pic shown.
This pack is just on 4 month old and was first used last year November.
Total of a max 15/16 charges through it.
My packs get used once a day and are always discharged, equalized and then charged for the race.
What was surprising about this pack was that it was sitting for around 3/4 mins before it vented.
Pack was charged at 5amps with .3mv cutoff.
The table used is a masonite table with metal edges but pack was not in contact with the metal edging at any time.
My second incident happened on Saturday evening when i assembled a new pack.
After assembly i left pack to cool from the soldering and then put 1000mah into it before discharging and putting in the equalizer tray and then left one side as i assmbled another 2 packs.
I later put the pack on charge at 5amps and about 10 mins into charge one cell vented, thinking it was going to explode like the previous one i quickly left the room with my wife and after a few minutes i went back in with a damp towel and covered it and left it outside.
All the other packs where fine.
The amazing thing is that besides the cell venting first is that there are no signs of the cell being faulty.
Yes that cell should be getting very hot but unfortunately the temp probe can only on be 1 cell or between 2 cells depending which sensor you use.
Id suggest any and all racers take that little bit of extra precaution and charge/discharge packs in a container of some sort.
In future id rather be safe than sorry and cant wait for Lipo to be legal to use here in SA.
Have 4600 packs on the way and hope they are much more safer than the IB4200.
casterracing EX-1 Pro, SP Silver Arrow
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