Battery swollen and keyboard not working

I noticed last night that my keyboard on my 2010 macbook pro wasn't working and later also noticed that the bottom of the casing was being pushed away from the rest of the body by the battery which has swelled. I've had to remove the bottom of the casing to relieve the pressure on the battery as I don't have the required tools to take it out. Obviously this is an issue as I don't want it to end up exploding. I am out of warranty but I feel I still shouldn't have to pay ridiculous amounts to get my battery and keyboard replaced as it shouldn't be doing this after only 5 years.