Killing Sleeper Drones

I've been traveling the Eve universe for a long time, however I've had some real life commitments that have been keeping me busy and I haven't had the time to make any money. So today I found a wormhole in a nearby system that I normally work out of. So I explored the wormhole and found some sleeper drones to kill. I brought my brutix battlecrusier Liberty to deal with the sleepers. Although I haven't been playing actively I have been leveling my skills so I did ok for the most part. Unfortuantely, each time you kill a group of sleepers a new group arrives to replace them. I did fine until one of the waves had a battleship in the group. Unfortunately, a battleship beats a battlecruiser every time. I figured that Id cut my losses and head for home. I was able to make about 5-6 million isk from my adventure so I can't complain. Next time Ill have the money to get a battleship of my own and then they will be the ones running for home..