Why tapping a TV remote can make it work again

Many users have encountered a common issue: pressing buttons on a remote control only for the TV to fail to respond. A typical reaction is to tap the back of the remote near the battery compartment before trying again.

While the action may seem crude, it can sometimes be effective. One leading explanation, cited by tech site BGR, is that tapping helps remove oxidation that forms on battery contacts, enabling the batteries to resume supplying power.

Remote control batteries often remain unused for extended periods, sometimes months or years depending on usage. Over time, a layer of oxidation, typically appearing as white or greenish residue, can build up between the battery terminals and metal contacts, such as springs.

This oxidized layer has high electrical resistance, which obstructs current flow and causes a voltage drop, preventing the remote from functioning properly. Since remotes consume very little power, generating only a brief infrared signal when a button is pressed, the current is often too weak to overcome this resistance.

A person uses a TV remote. Illustration photo from Pexels

According to Science ABC, tapping the remote causes internal components to shift slightly, improving contact between battery terminals and connectors. The movement can also break up oxidation, reducing resistance and allowing current to pass through.

Users can achieve similar results by rotating the batteries or removing and reinserting them.

To prevent oxidation, BGR recommends removing batteries from devices that are not used regularly. Users should also check batteries periodically and clean any residue using a soft brush, followed by wiping the contacts with a cotton swab dipped in isopropyl alcohol.