Why does my digital clock keep losing time?
This can be due to power interruptions and the status of the backup battery installed in the unit. For example, if a power interruption occurs and the clock radio operates on a backup battery, time may be gained or lost depending on the strength of the battery.
Why are car clocks inaccurate?
Most of the clock in todays’ cars use electronic crystal oscillators. Crystal oscillator sold for around a dollar or less in bulk have a typical error tolerance of +/-100 ppm. Temperature changes and aging can contribute another +/-100 ppm.
Why does the clock in my car gain time?
That makes most car clocks dependent on the quartz crystal. Quartz crystals generally have an specified accuracy somewhere around 100 ppm – parts per million which means that they will fall somewhere in between and the error won’t be constant, it will be function of time (age) and temperature.