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What is the battery life of the PM800 series meter.

The PM800 series battery is rated at 120mAh. The batter is used in the absence of control power to keep the
processor clock active. The battery is not activated at the factory, but instead when the time is first set in the device. 
 
If the meter does not have control power (inactive) applied:
 
Battery Capacity: 120mAh
Battery Draw: 0.001mA
Battery Life: ~13.7 years
 
If the meter does have control power (active) applied:
 
Battery Capacity: 120mAh
Battery Draw: 0.0001mA
Battery Life: ~137 years
 
 
Note: The PM810 does not have a battery. Only the additional logging module (PM810LOG) gives the
PM810 real time clock capability however PM820 & PM850 have the battery.
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