The RACE RESULT active transponders report their battery level in the timing module with every passing.

It is not possible to determine the exact voltage brand new transponders should display, since the voltage depends on a number of factors, including temperature, but it should be above 2.7 V.

After a couple of years of usage, you should start monitoring the battery level of your transponders.

We do not recommend using transponders with a voltage of 2.3 V and below. The battery cannot be replaced, as the transponders are sealed and they would not be waterproof anymore after being opened. Once the battery is empty, you will need to buy a new transponder.

The discharge curve of the battery gets very steep at the end of life, at 2.2 V it is almost empty. Theoretically, transponders can work down to 1.8 V, but we cannot guarantee reliable operation, especially when used cold.

If you have transponders which you suspect are on low battery then read our guide on Active Transponder Battery Testing.