resultTivù said:If the Remote Telecommander hasn't been used much in the months leading to its demise, it is not uncommon for one or more battery terminals to corrode as the result of galvanic action and/or battery leakage.
Remove batteries, clean contacts with edge of a screwdriver blade or similar, taking care to hold the device so that any loosened bits of corroded material don't get inside.
Fit fresh batteries.