To change the battery in a 2004 Acura RSX, first, ensure the vehicle is turned off and parked on a level surface. Open the hood and locate the battery; disconnect the negative terminal (black) first, followed by the positive terminal (red). Remove the battery hold-down clamp, then lift out the old battery. Place the new battery in the tray, reconnect the positive terminal first, followed by the negative terminal, and secure the hold-down clamp.
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