Charging The Battery - Agilent Technologies U1401A Schnellstart Handbuch

Charging the battery

A new rechargeable battery comes in a discharged condition and must
be charged before use (refer to the U1401A User's and Service Guide
for charging instructions). Upon initial use (or after a prolonged
storage period) the rechargeable battery may require three to four
charge/discharge cycles before achieving maximum capacity. To
discharge, simply run the multimeter using the rechargeable battery's
power until it shuts down or until the low battery warning appears.
In some instances, the multimeter may indicate that the charging is
complete after ten minutes or so when charging a new rechargeable
battery. This is a normal phenomenon with rechargeable batteries.
Remove the rechargeable battery from the device, re- insert it and
repeat the charging procedure.
U1401A Quick Start Guide