Agilent Technologies U1602B User's And Service Manual page 202

8 General Disassemble
Do not use non-rechargeable batteries (alkaline, carbon-zinc, etc.) with AC power
WA R N I N G
adapter connected.
For battery replacement, ensure the new battery pack are located in the correct polarity in
N O T E
the battery compartment and proper contacts between the 3-wire connection to the PCBA
board. Assemble the battery pack into the instrument by following the reverse diassemble
process.
Agilent U1602B/U1604B User's and Service Guide 163