JobClocks use lithium 123 batteries. This is a very common, 3 volt, barrel type, camera battery that is available almost anywhere.

The average life of these batteries is between 6 to 9 months. However, in colder weather, average life is about 3 to 6 months.

Lithium batteries last three times as long as alkaline batteries and perform much better in digital cameras and other high-draining devices. Lithium batteries are designed to give you the most potential amount of power it can for the longest time it can.

There are two places to monitor the battery:

  1. On the front of the JobClock, there will are two 2 LED lights, one red and one green. The green one will be on the right side of the curved window and the red one will be on the left side.
    1. Green blinking by itself – battery is working
    2. Green and Red flashing alternating – battery is getting low (replace it now)
    3. Green and Red flashing at the same time – battery lost power and reset – records likely saved to 1970
  2. In TimeSummit, under the “JobClocks” section, there is a JobClock column that displays the voltage of the battery. This number is updated every time data is collected from the clock. On average, a good battery will show around 3 volts +/-. When the voltage shows close to 2.65 volts, it’s time to change the battery. It’s recommended to change the battery around 2.65 volts, simply because if the battery voltage drops any lower, there is a risk of the battery losing power and resetting the time records to 1970.

The best thing to do is keep a close watch on the battery and change it when needed, before it fails. Make sure when purchasing new batteries, check the expiration date to be sure they’re not expired.