Getting Started 1 
Agilent U1602B/U1604B User’s and Service Guide  5
To Charge a Battery
✔ Before using the instrument for the first time, fully charge the battery 
for approximately 25 hours with the unit turned on by using the 
designated Agilent AC adapter. Ensure that you have the correct line 
power cord (refer to Table 1- 1). The AC adapter automatically converts 
input line voltage ranges from 100 VAC – 240 VAC, 50/60 Hz to output 
voltage 12 VDC, 2 A.
A new rechargeable battery comes in a discharged condition and must 
be charged before use. 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 oscilloscope under the rechargeable battery's 
power until it shuts down or until you get a low battery warning.
To avoid instruments being damage from battery leakage, always remove dead 
batteries immediately.
For quick charging mode with instrument turned off, the charging time is approximately 4.5 
hours.