another start up problem

[NoName]

I took my car to work today because we have heated parking. Long story short i hooked up a new brake light socket because mine was corded causing the brake lights not to work at that light and the stop lamp light came on everytime i pressed the brakes.
ANyway, after the switch i went to start the car to see if the light still came on. When i started the car it died in the middle of cranking like i didn't have enough battery juice. Now when i try to start it again it doesn't even click, i tried to start it in park and neutral. I check all my fuses none are blown. I unhooked the lamp even. I did voltage test on the battery and it is 11 volts with no load and around 7 when i have the key in the on position. Something really drained my battery, but also the car won't even try to start. I have had issues before and i was able to try to start my car till the lights and radio don't work anymore. Anyone have advice. It is a minor emergency for me as I will be stuck at work with no resolution