GRAUPNER mz-24 Pro Programming Manual page 21

Receiver System Power Supply
NiMH Battery Packs - 4 Cells
With a traditional 4-cell pack, the Graupner HoTT sys-
tem can be reliably operated providing that the above
conditions are observed, and assuming that the packs
have a sufficient capacity and charge.
NiMH Battery Packs - 5 Cells
Battery packs with five cells offer greater leeway in
comparison to 4-cell packs.
Note that not every servo available on the market can
handle the voltage from a 5-cell pack over the long
term, especially when the pack is freshly charged.
Some of these servos audibly "growl" when operated
with a 5-pack.
Notice
Note the specifications for the servo before de-
ciding to use a 5-cell pack.
LiFe Packs - 2 Cells
Given the above considerations, these cells are the
best choice.
LiFe cells are also available in a hard plastic housing
to protect against mechanical damage. Like lithium
polymer cells, LiFe cells can be charged quickly with
suitable chargers and are comparably robust.
In addition, this type of cell can undergo significantly
more charging/discharging cycles than conventional
LiPo batteries. The comparatively high rated voltage
of 6.6 V of two cell LiFe battery packs does not pose
any problems to Graupner HoTT receivers or the ser-
vos, speed controllers, gyros, etc. which are approved
for operation with this higher voltage.
Attention
Note that practically all of the previously market-
ed servos, speed controllers, gyros, etc. as well
as newly released servos have permissible oper-
ating voltage range of 4.8 to 6 V. Stabilized voltage con-
trol such as the PRX (No. 4136) is needed to connect
them to the receiver. Otherwise, the connected devices
may become damaged.
LiPo Packs - 2 Cells
LiPo batteries are lighter yet they offer the same ca-
pacity of NiMH batteries. LiPo batteries also come in
a hard plastic housing to protect against mechanical
damage.
The comparatively high rated voltage of 7.4 V of two
cell LiPo battery packs does not pose any problems
to Graupner HoTT receivers or the servos, speed con-
trollers, gyros, etc. which are approved for operation
with this higher voltage.
Attention
Note that practically all of the previously market-
ed servos, speed controllers, gyros, etc. as well
as newly released servos have a permissible op-
erating voltage range of 4.8 to 6 V. Stabilized voltage
control such as the PRX (No. 4136) is needed to con-
nect them to the receiver. Otherwise, the connected de-
vices may become damaged.
Charging the Receiver Battery
To charge the receiver battery, directly connect the
charging cable (No. 3021). If the battery in the model
is connected by a power supply cable (No. 3046,
3934, 3934.1 or 3934.3), the battery is charged via the
charging socket integrated in the switch, or a sepa-
rate charging connection. The switch for the power
supply cable must be set to OFF for charging
Polarity of the receiver battery plug
Installation notice - Receiver system power supply
.
21