I think each time you replace the battery you need to pair the two units again. I never remember how to do that which is one of the reasons I saved the instructions.
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A conclusion is the place where you got tired of thinking. - S. Wright
Favorite rides in the stable: Indy Fab CJ Ti - Colnago MXL - S-Works Roubaix - Habanero Team Issue - Jamis Eclipse carbon/831