FREEZING YOUR BATTERY
I will tell you a very effective method that you can try and see:
1. Wrap the battery up with newspapers, put it into a plastic bag and then into the freezer for three days (the newspapers will absorb the accessive moisture).
2. After three days, take out the battery and leave it in normal temperature for two days.
3. After two days, fully charge up the battery and put it into your mobile phone and see (this is estimated to be able to salvage about 80%-90%)
This information was provided by an engineer in a well-known battery factory. I tried it and the method appears to be quite effective.
In any case, as everyone has a refrigerator, why not try it out and see?