i have one 3s 2200mah 25c 11.1v lipo which i didn't charge for 4 months.. now when i am charging it only 1st and 3rd cell is charging and they are fully charged. but the middle one can't be charged .. can anyone please help me or give me any hint to fix it??

The cell might be dead?

can i save other two cells any how?

See this image..This is how you can use 2 lipo cells and can create 2s battery......
And if possible see my latest post.... First discharge the battery upto 3.3v and then perform theses things

You actually need to know how to solder.....For preparing proper connections
Always keep your connections tight, clean and strong .

u could save the middle cell.   
1 check voltage.  if its below 2.8.     charge it manually by mobile charge for 30 seconds . and let it rest for 5 mins. then repeat this for 3 times.  .

that's it

thank u sukhpreet thanks a lot.. now i have 2s 22oo mah 7.9 v lipo... thanks for the help..

i isolated the middle cell at it was showing 0.1volt.. i put two AA battery in series (3v 1A) and connected with the lipo... now after 1 hour the cell have 2.01v.. i think now i can use ur suggestion .. hope it will work...

Happy to help Trishul

http://www.rcindia.org/rc-general-topics/troubleshootingreviving-lipo-batteries/msg247256/#msg247256 SEE IF THIS HELPS

Hey guys!

I think it's very risky to open the pack yourself unless you have the skills to do it. The packs are made in a sophisticated facilities with controlled temperatures and you don't want to locally raise the temperature which will pretty dangerous. And its not worth risking for a Rs. 1000 pack.

Also a tip on storage: Discharge the batteries to 60% before storing. And whenever possible charge once every two months. Puffing happens when the temperatures of storage differ drastically. Try to keep in a cold and relatively invariant temperature.

May be these are just too much to do but they do help in long run.

Cheers!
-Pravin