I have a lot of LiPos. Seems as though all of my 2s Venom batteries are puffing. For no reason.

My batteries:
4- Venom 2s 4000mah 20c (3 of them puffed)
1- Venom 2s 4200mah 25c saddle pack (one half puffed)
1- Venom 3s 5000mah 35c (slightly puffed)
1- Venom 4s 5000mah 35c
1- Orion 2s 5800mah 100c saddle
2- Trinity 2s 3400mah 80c shorty titanium
1- Trinity 2s 4500mah 50c titanium
1- Turnigy 2s 4850mah 50c Nanotech
1- Turnigy 2s 5000mah 20c
1- Racers Edge 2s 4500mah??

They are all used in 1/10 scale vehicles. 2wd buggies, trucks and touring cars and one 4x4 SCT with a castle 1415 set up in it (Only uses the 3s or the Orion and the 4s is for my RC8.2E). They are never charged without balance, I have the original red venom pro charger and a Hyperion EOS0720 net3 chargers. The batteries never get over 80 degrees (except the shorties) and I take very good care of my batteries. never had one cell go under 3.4 volts or over 4.2. I just can not explain why these packs are puffing. I am extremely disappointed with venom batteries. At this point I will never buy another Venom, but are they just junk? I will be emailing them to see what they do about them. I never registered them when I bought them but I do have receipts.