GRAUPNER mc-16 Programming Manual page 57

Note:
An overview of available batteries, chargers
and current source test instruments can be
found in the Graupner RC main catalog or in
Internet at www.graupner.de. A selection of suitable
Computer chargers are listed in the table on page
18.
Receiver system power supply
NiMH 4-cell battery packs
In compliance with the aforementioned conditions, your
Graupner HoTT receiver system can be readily oper-
ated with traditional 4-cell battery packs as long as the
packs have adequate capacity and voltage level.
NiMH 5-cell battery packs
Five-cell battery packs offer a greater voltage tolerance
than do 4-cell packs.
However, be aware that not every servo available on
the market is able to tolerate the voltage level output
by a 5-cell pack over the long term, this is particularly
true when the battery pack is freshly charged. Some of
these servos react to this with a noticeable "grinding"
sound.
Therefore pay attention to the specifications of
the servos you use before making a choice for
a 5-cell battery pack..
LiFe 6.6 V batteries with 2 cells
From a contemporary perspective, these new cells are
the very best choice.
LiFe cells are also available in hard plastic casings to
protect them from mechanical damage. Like LiPo cells,
LiFe cells can be quick charged in suitable chargers
and they are comparatively robust.
This type of secondary cell battery is also rated for a
significantly greater number of charge/discharge cycles
than, for example, LiPo batteries The nominal 6.6 V
output of a 2-cell LiFe battery pack does not present
a problem for either Graupner HoTT receivers nor for
those servos, speed controllers, gyros and other devic-
es which have been specifically approved for operation
in this – higher – voltage range.
Please note however that practically all
servos, speed controllers, gyros and other
devices built in the past and most such
devices currently still offered on the market have
only a permissible voltage range of 4.8 to 6 V. Use
of these batteries in conjunction with these devices
demand use of a stabilized voltage regulator, e. g. the
PRX, No. 4136, see appendix. Otherwise there is
danger that attached devices will incur damage within
a short period of time.
LiPo 2-cell packs
For a given capacity, LiPo batteries are lighter than, for
example, NiMH batteries. LiPo batteries are also avail-
able in hard plastic casings to protect them from me-
chanical damage.
The comparatively high nominal voltage, 7.4 V, for a
2-cell LiPo pack does not present a problem for either
Graupner HoTT receivers nor for those servos, speed
controllers, gyros and other devices which have been
specifically approved for operation in this – higher – volt-
age range.
Please note however that practically all
servos, speed controllers, gyros and other
devices built in the past and most such
devices currently still offered on the market have
only a permissible voltage range of 4.8 to 6 V. Use
of these batteries in conjunction with these devices
demand use of a stabilized voltage regulator, e. g. the
PRX, No. 4136, see appendix. Otherwise there is
danger that attached devices will incur damage within
a short period of time.
Charging the receiver battery
Charger cable, No. 3021, can be plugged directly onto
the receiver's battery for charging. If the battery in the
model is connected by way of an No. 3046, 3934,
3934.1 or 3934.3 power supply cable, then charging
can be accomplished via the charging jack or special
charging connector integrated into the switch. The
switch in the power supply cable must be in its "OFF"
position for charging.
Receiver battery
connection polarity
Receiver power supply 57