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101515-0 RMLD MANUAL REV
F
Chapter II
Battery Charging
Rechargeable Battery
The RMLD has an internal, rechargeable Li-ion battery that provides the main power to
the instrument. This battery is designed to provide 8 hours of operating time when fully
charged. The battery must be recharged between use to assure no interruption in use.
The display features a battery life remaining indicator. Accuracy of this indicator is
within 20% of the actual capacity. This indicator should be used only as a reference.
Always start the day with a full charge to ensure a full day’s use.
To maintain the best accuracy of the battery indicator, periodically deep discharge the
battery and then fully charge the battery without any interruption. To deep discharge the
battery, allow the instrument to run until it shuts itself off. This should also be needed if
the indicator does not follow the actual charge, e.g., if the instrument stops operating
while the battery indicator is reading that a charge remains or if the indicator is flashing
Fig. 2-1
Battery charge
indicator
**Note**
To obtain full battery capacity, charge the battery when the ambient temperature is above
50º F (10º C).
**Caution**
To prevent damage to the battery or electrical circuits, always plug the charger into a
surge-protected outlet.
**Note**
The prolonged un-use of battery inside or outside the instrument can lead to battery chemistry
being irreversibly damaged leading to permanent failure of the battery. It is recommended to have
the battery go through at least one (1) charge-discharge cycle once every month if the battery is
not being used for long periods of time.
When storing the instrument or the battery for more than a week, leave the battery charged up to
about 40% and store at room temperature of about 60-70º F.