Specifications

6.8. DC-190 AC / Battery Operation
The DC-190 can be operated with AC power or with the optional internal
battery. The battery will automatically charge whenever the scale is
plugged into AC power. The charging current is regulated by a battery
monitor circuit, so that the battery can not be overcharged.
The DC-190 system is powered internally at a low power level whenever
the scale is plugged into the AC line or the battery switch is in the “ON”
position. The battery power switch is located on the bottom of the scale directly under the
serial number on the side panel. The front panel “ON/OFF” switch enables the display and
primary power.
When the battery switch is “ON” and the AC is not connected, a low level
battery current will flow even if the display is “OFF”. To prevent battery
discharge when stored turn the battery switch to “OFF” whenever unit is
not used.
Do not store the scale without turning off the battery power switch.
CHARGING TIME: FOR OPTIMUM USE AND BATTERY LIFE, THE
DC-190 BATTERY SHOULD BE FULLY CHARGED BEFORE EACH
OPERATING RUN.
NOTE: Short Cycle Charging Will Reduce The Normal Use Time And Can
Drastically Reduce Battery Life.
The BP-190 battery is a sealed lead acid battery which needs to be charged
periodically, similar to a car battery, if the BP-190 is left on the shelf for several
months without being charged it will eventually drain to point that it can no
longer be charged!