I have a dual battery setup in my TA22. I use a standard battery to start the car and I have a big $120 battery to run the stereo. The dual setup looks factory fitted in the engine bay. Funny enough both batteries were chucked out last week. They were getting old and didn't want to run the risk of them leaking. I'm now in the market for two new batteries. I dunno what I'm gunna buy yet, but the last ones were Century. Let me know what you end up getting and how much they cost.