NARDA NBM-550, Operating Manual

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3.3 Power supply NBM-550
Narda NBM-550
21
Charging the batteries
If the device is probably not going to be used for several
weeks, it should be recharged before being stored to avoid
the possibility of deep discharge of the batteries. If storage
is likely to be for a period of more than two months, remove
the batteries from the device after recharging them.
Note:
Deep discharge can significantly reduce the battery
capacity. This is indicated by unusually short charging
cycles. If this happens, the nominal capacity can be
restored by discharging and recharging the batteries several
times. Regeneration usually takes four to five recharging
cycles.
Note:
A complete charge cycle takes about 2 hours (with the
instrument switched off).
Starting the charge cycle
✓
The AC line voltage must match the operating voltage of
the AC Adapter / Charger.
1. Connect the AC Adapter / Charger to the charging
socket of the NBM-550.
2. Connect the AC Adapter / Charger to the AC line

The charge cycle starts.

The
Charge
LED glows red during the entire charge
cycle.
As soon as the batteries are fully charged, the AC Adapter /
Charger switches to trickle charge mode and the
Charge
LED glows green.
WARNING
Charging the batteries with wrong AC
Adapter / Charger
Overheating, explosion, or ignition of rechargeable
batteries/batteries or their surroundings

You must use only the AC Adapter / Charger supplied
to charge the batteries.