I think all the battery does is keep the on-board clock running while the unit is unplugged. All other settings are auto-detected or stored on the hard drive.
Even if the battery does fail, all you should need to do is make a connection to TiVo (testing the connection should work just as well) and it'll set the clock to the correct time like it usually does.
Sony SVR-2000 (S1) @ 160GB (retired)
TiVo TCD648250B (S3, Lifetime) @ 1TB (thanks
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TiVo HD XL (S3, Lifetime) @ 1TB - CableCARD/TA
TiVo Premiere XL4/Elite (S4, Lifetime) @ 2TB - CableCARD/TA