The BOLEX battery is designed for the MST motor but
can be used for other purposes where a similar voltage
and amperage is required. The battery can be used in any
position and requires no maintenance. A case is provided
for convenience and ease of carrying.
The BOLEX battery is made up of ten SAFT-Voltabloc
cadmiumnickel, alkaline cells, insulated with calcined
plates, and of 1 AH. capacity. These cells provide for a
high load when starting the motor and can be used as a
power supply even during mains recharging. A built-in
rectifier is suitable for 110-125 v. and 220-250 v. (50
or 60 C/S) supplies. Accumlator level can be checked at
any time by moving the voltmeter button upwards.
Voltage: 12 v. DC
Load, with 100 ft. spool; on starting, 4 amps; at
stabilised speed 0.7 - 1.4 amps.
Load, with 400 ft. magazine; on starting, 5 amps; at
stabilised speed 0.9 - 1.8 amps.
When fully charged, the battery capacity is equivalent
to five 400 ft. magazines or twenty 100 ft. spools, at 24
or 25 f.p.s., - corresponding to 60 minutes' running of
the MST motor - within a temperature range of zero
degrees Centigrade to fifty degrees Centigrade. Battery
capacity decreases between temperatures of minus twenty
degrees Centigrade and zero degrees Centigrade and
between fifty degrees Centigrade and sixty degrees
Approximately 15 hours is needed to fully recharge the
Battery life: approximately 1000 discharge-recharge
Recharging fuse: 50 mA/250 v.
Battery dimensions: 8 inches x 2 inches x 4 inches
(202 x 52 x 96 mm.)
Weight, including case: Three and a half pounds
Start the MST motor and push the button upwards: the
pointer should go beyond the black zone. If it does not,
the battery should be recharged before filming a sequence
of any length. The cadmiumnickel cells are liable to
deteriorate if the motor is used when the voltmeter
pointer remains in or below the black zone, indicating
1. Move the red mark on the selector to the voltage
corresponding to the mains supply using a screwdriver or
a thin coin.
2. Plug lead into the mains. The red indicator should
light up during recharging. If it does not, check the
fuse by turning knob in the direction of the arrow.
The battery can be stored for a long time without any
risk of deterioration providing the voltmeter pointer
does not fall below the mark indicating the safe limit of
A wiring diagram is shown above.
1. Power lead to MST motor
2. A three-pole connection allows pilot signal
connection but owing to the variety of tyes of
tape-recorders, only the corresponding plug is
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