5 Maintenance
150 Keysight U1253B User’s and Service Guide
Charging the battery
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
battery may require three to four charge/discharge cycles before achieving
maximum capacity. To discharge, simply run the multimeter under the battery's
power until it shuts down or the low battery warning appears.
Do not discharge the battery by shorting it or subjecting it to reverse
polarity. Make sure a battery is rechargeable before charging it.
Do not rotate the rotary switch when the battery is being charged.
– Do not rotate the rotary switch from position when charging the
battery.
– Perform battery charging only with a 9 V Ni-MH rechargeable battery
(7.2 V nominal voltage) or 9 V size Ni-MH rechargeable battery
(8.4 V nominal voltage)
– Disconnect test leads from all the terminals when charging the battery.
– Ensure proper insertion of battery in the multimeter, and follow the
correct polarity.
For the battery charger, the mains supply voltage fluctuations must not
exceed ±10%.
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