2007 Hyundai Accent BATTERY

My has been having battery problems for a while sometimes it goes not completely dead, but theres not enough juice to start it. It did that a few times and I took it to the hyundai dealer and they said to drive it around more to charge up the battery. I've did that and charged it up with the battery charger and even brought the battery inside. I did get a compand start put in, in january. It seems like theres something draining the battery, I took the car downtown one about 5 blocks and came home, went back to start the car a little while later and it didn't want to start. I had to charge the battery, they said it charging at a 13.