Optima Battery Dead in under 3 months

[lino]

My Optima Red 34/78 Battery died. I didn't turn on the car for 8 days straight and when I went to start the car, the battery was completely dead. No lights in the dash at all. The car was parked in the driveway and it was really cold the entire week. It had also snowed. I'm wondering if something could have drained my battery or if there is a possibility that the real cold temperatures could do it. I didn't even have my alarm system on. Anyway, I went and got a brand new battery under warranty. I haven't installed it yet though.

Here are some pics of the of the original one when I bought it. I got the exact same one again:





Does anyone know where I can buy a battery blanket?