User manual for poly-phase meter
25
12 Battery
The meter has a 1200mA internal lithium battery and 220mA external changeable
lithium battery（optional）. When the meter is powered off, the battery supplies for
RTC, LCD display.
12.1 Back-up power
12.1.1 Low battery detection
⚫ When the meter is power on, the voltage will be measured by AD sampling per
second.
⚫ The accuracy of voltage measuring is ±0.1V.
⚫ When the battery has been found low voltage (less than 3.0V) for 10 continual
seconds, a low battery sign can be displayed on LCD, to remind customer to change
the battery.
12.1.2 Battery working lifetime
⚫ Average working current
➢ Meter power on I<1µA
➢ Meter power off 15µA<I<30µA
⚫ Working lifetime
➢ The battery can be used at least 10 years.
➢ When the meter power off, the lifetime of battery can be at least 2 years.
12.1.3 External battery replacement
1） Power off the meter.
Customer should replace battery after powering off the meter. If it is inevitable to
replace battery when power on, please be even more careful for replacement operation
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