4200's venting

[craigosh]

Got some 1 run only 4200's off ebay and when i cycled them last night they vented leaving some nice stains on the paper below them... Do i need to worry about it?

They didnt do it this morning when i discharged them a little then repeaked them and the temp gun says they are reaching about 57C each cell which i read on SMC's site is about right..

Charging them on an eagle CDC at 6amps and the peak detect is 5mv (per cell)

[DCM]

drop the peak detect to 3mV per cell (18mV per 6pack) and drop the charge rate down to 5 or 5.5 amps, if they are still venting, I would think they have been used a few times and not the once.

[cabbynate]

When I got my brand new ib3800's they vented.:mad:
All three packs. They ran ok for about 4 meetings and now the ir's went way up. If I let them set to long they vent again. I charge them on a compatition electronics turbo 35 gfx 5 amps with a low vc. I'm not liking the ib cells much. I think I will stick to GP's.

[jimmy]

I read that some of these high capacity cells are really SUPER AMAZING for the first few charges then rapidly die, if thats true then its a really bad thing for the sport.

[craigosh]

Well they were superb in the street before, with the brushless in the bj4 so we'll see how they go..

My IB3800's are lacking a bit now, after a few months, probably due to never being equalised (I know!!! i just havent got round to buying a tray yet!!!) but do go well on the second run. But my gp3700's are still going strong.

[jimmy]

I have read and been told the latest 4200 cells dont like equalizing or at least should be charged right after equalizing. I used some of the latest 4200's at the euros craig and youre right, superb doesn't even come close, my bj4 would wheelie on command.

[Richard Lowe]

My Demon 42's are still as good as they were at the start of the season so far, one pack has vented a bit on discharge but it's still as good as the rest :bom:

[jimmy]

good to hear richard, I have just heard a lot of stories about the latest high capacity cells venting, not really any particular brand either.

[Southwell]

Ive had some vent, but they still work just as well as the others. I dropped the peak detect, cant remember what to but will check soon.
Personally i wouldnt worry about it.

[DCM]

I usea my cells, take them out of the car and stick them in a box, then discharge and tray them before charging, I don't see the point of traying them after use.

[craigosh]

cheers lads.. they seem fine now, ran well both times i used them today, and no more venting... The bj isnt quite wheeling Jim but i have only got the novak 6.5 in :-D