Charging Times - Nagra Seven Operating Instructions Manual

CHAPTER I
YOU NEED POWER FIRST
The Nagra Seven is delivered with an empty battery box, into which 8 rechargeable NiMh "AA" cells can be
installed. We do not recommend the use of dry cells except in emergencies. The running time of the recorder
depends upon the capacity of the cells used, as well as the operating mode. Alternatively an optional Lithium
Polymer pack can be used. The supplied external DC supply can power the machine, and recharge the batteries
at the same time.
Charging of the battery packs
The detachable battery boxes, and Lithium Polymer packs are fitted with a RED LED to indicate when external
DC is present and the charge status.
When external DC is connected the LED will light and if rechargeable cells are installed in the battery box it will
start to flash after a few seconds to indicate that the cells are being charged. When fully charged, the LED will
remain ON. No harm will be caused to the lithium packs if the external charger is left connected as they cannot
be "Overcharged".
Charger ON / OFF switch
Removable battery box for "AA" size cells
Some approximate times are shown below using the Nagra charger and supplied power supply:
Battery type
NiMh
Lithium Polymer
Dry Cells
The above trials were made with fully charged cells, with the recorder in continuous Record mode with using
dynamic microphones and time code running and the display set to "dimmer" mode.
The optional 3200 mAh lithium-polymer rechargeable pack is available (Part Number # 70 19166 000) can also
be used giving an autonomy of about 8 hours. External DC can also be used by connecting the supplied, wall-
mount charger to the DC connector. The use of standard "AA" cells is not recommended as their discharge rate
will exceed the specifications of the cells. However, they can be used in an emergency, but will be drained
quite quickly, and will get quite hot while being used.

Charging times

N7-BB1 3.2 Ah Lithium Polymer battery pack is approximately 5 hours.
Eight 2'500 mAh NiMH cells will take about 3½ hours to charge.
Capacity
2500 mAh
3200 mAh
4
THE POWER
Approx. Running time (with 2
+48V condenser mics)
5h (4h)
8h (6h)
2h45m (2hr)