I have 4 zippy K packs, 2 4300mAh 2S and 2 4300mAh 3S. One of each has failed on me. The 3S that failed had 1 maybe 2 cells puff while the pack was just sitting on my dinning room table this summer. I was monitoring the voltage on a regular bassis and one day when I went to check the pack was puffed.
The 2S that failed had a dead cell from the get go. It never took a good charge on my ballance charger. Returning isn't an option becasue the shipping would be more than I have in the packs.
The other two that are still good work great. I use them in a variety of cars, rustler 2S, and 3S, the converted revo has been run on 3S (becasue I forgot my series connector), but usually 5S (2S + 3S). The packs don't get more than 105f in the heat of the summer.
I must be a glutton for punishment though becasue I have a 3S 4000mAh and 6S 4000mAh on the way that are to be run in series (when I get lutach's 10S esc), and 2 of the 4000mAh (suposed to be 25C)hard case 2S packs that they just released also on the way.
All that said though I do plan on buying two of Mikes 5S2P 5000mAh packs for my Muggy when he gets them back in stock. Sorry for the long winded reply.
thanks for the reply, it backs up what I'm saying, people are buying zippys. surely a zippy witn an RCM sticker on it is worth more than one from hong kong
_______________________________________
It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.