Battery has 11.6 volts for my Indian, won't start after over a week of no use sitting outside in the cold

Would love some tips here -- do I get a battery tender or a charger to get me out of this situation? Also, when I bought this bike I noticed there was already a little wire tucked away at the bottom to connect a tender to but as I'm reading about this stuff I've noticed some people say that a tender isn't to be used to charge a dead battery. I don't think 11.6 is quite dead as everything works like the lights and display