I purchased a round button model 2 Saturn at a thrift store for $5. After selling my oval button off I ordered a standard modchip from Sega Style. That... didn't end the tinkering. First order was to ditch the 2032 battery for something better. After a couple prototype battery boxes, I settled on this- It's a standard $1.69 AA battery box from Radio Shack. I replaced the stock wires with something more durable and mounted directly to the rear port cover. The wires are soldered directly to the battery connections in the console. It uses two Energizer Lithium AA batteries(expensive little things, about $2.50 per battery). But by comparison, a 2032 is 200 MAh, the AAs are 2600 MAh. That's 13X the battery life. I also removed the stock green power LED and replaced it with a blue one.