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If the radio and clock stopped working immediately after the new battery was installed, chances are they blew out at least one fuse in the process. Did you drive it after the new battery was installed? Possible they hooked up the polarity incorrectly, which would cause all sorts of problems (rear expensive diagnosing).
Double check the battery is hooked up right - negative terminal to the negative post, positive terminal to the positive post. Also verify that the new battery has power - sometimes you can get a dead one right off the shelf, if it sat around too long. Voltmeter would come in handy here, as well as help with diagnosing this issue.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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