Hach DR 2800, User Manual, Page: 75 / 96

75
Maintenance
7.2.1 Charging the Battery
CAUTION
Use only the manufacturer's specified external power supply
to operate the instrument and charge the internal lithium
battery pack. The specified power supply and its plug shape,
voltage rating (12V, 2A) and electromagnetic characteristics
are critical to ensure DR 2800 performance and the safety of
the user.
Important Note: Optimal ambient temperature for charging the
lithium battery to 100% is 10–30 °C (50–86 °F).
The battery is charged automatically when the plug-in power supply
is connected and is plugged into a mains socket (100–240
Volt/50–60 Hz).
The time required to charge a newly installed battery is about
3.5 hours.
Operating time of a fully charged battery:
If a battery is charged to 100% capacity, and the user carries out 10
measurements per day, and the instrument is left on after each
measurement for the full 15 minutes before it automatically
switches off, the battery can be used for 7 days before it needs
recharging.
7.2.2 Battery Life
The battery has a limited lifespan. The more it is used, the more its
capacity is reduced. If a fully charged battery only allows the
instrument to be used for a relatively short time, replace the battery
with a new one.
Note: The battery does not need to run down completely before
recharging. Recharging the battery with a residual charge does not
reduce capacity.
Figure 11 Battery Replacement
1 Cover Screw 3 Cover Screw Threaded Insert
2 Battery 4 Instrument Contacts