z wont start

[jcole8188]

so on saturday i was coming out of the gym, got in my car and it wouldnt start. i figured it might be the battery so my friend jumped it and it started right back up. Then sunday night after it was sitting pretty much all day i went to leave my house and it wouldnt start again. I tried jumping it but had no luck this time. its not the steering lock, ive already had that issue and was able to fix that thankfully by hitting it and pulling the fuse. Right now it sounds like its trying to start but its just not happening. the lights come on and everything so do you still think it could be the battery? when i just switch the ignition to on the volts are reading 10. The cars an 09 with 19xxx miles. i was thinking about just buying a new battery and testing that and if that didnt work just returning it. Any help would be appreciated.