Graupner GmbH & Co. KG MC-20 用户手册

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Discharging below 2.5 V per cell damages cells 

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permanently and is therefore to be avoided 
absolutely. The 

mc-20

 HoTT transmitter switches 

itself off when its power supply voltage reaches its 
lower limit of 3.3 V. Short circuit conditions are to be 
avoided absolutely. Permanent short circuits lead 
to destruction of the battery, high temperatures and 
perhaps even self-ignition may follow.
During discharge, battery temperature must not 

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rise, in any case, to over +70 °C. Otherwise, 
better cooling or a lower rate of discharge must 
be introduced. The temperature can easily be 
checked with the infrared thermometer, order no. 
1963. The battery must never be discharged via 
the transmitter's charging socket. This socket is 
not suitable for this purpose.

Never short-circuit the battery. A short-circuit 

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allows very high current to fl ow and this heats up 
the cells. This will lead to loss of electrolyte, the 
production of gases and perhaps even explosions. 
In the vicinity of, or while handling, Graupner
LiIo-/LiPo batteries, avoid electrically conducting 
surfaces because of the danger of creating a 
short-circuit condition.
Handling connectors:

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These connectors are not as robust as for other 
batteries. This applies particularly to the plus pole 
connector. The connections can easily be broken 
off. Due to thermal transfer, the connector tabs 
may not be soldered directly. 
Cell connection:

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Direct soldering on battery cells is not permitted. 
The heat of direct soldering can damage battery 
components, such as separator or isolator.
Battery connections should only be made by 
industrial spot welding. A professional repair made 
by the manufacturer or distributor is necessary to 

replace missing or torn-off cables. 
Replacing individual battery cells:

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The replacement of battery cells may only be 
made by the manufacturer or distributor and never 
by the user himself.
Damaged cell usage:

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Damaged cells may never be used or returned to 
service.
Characteristics of damaged cells include: 

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damaged housing packing, deformed battery cells, 
electrolyte or leaking electrolyte. In these cases, 
further use of the battery is not permissible.
Damaged or useless cells are hazardous waste 

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items and must be appropriately disposed.

Batteries must never be put in fi re or burned. 

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Battery cells must not be submerged in liquids, 

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such as water, seawater or beverages. Any contact 
with liquids, of whatever nature, is to be avoided.
Individual battery cells and batteries are not toys 

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and must therefore not get into the hands of 
children. Batteries/cells must be kept out of the 
reach of children.
Batteries must not get into the vicinity of babies or 

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small children. If a battery is swallowed, immediately 
go to a doctor or emergency medical facility.
Batteries must not be put in a microwave oven or 

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put under pressure. Smoke, fi re and more can be 
the consequences.
Never dismantle a LiIo-/LiPo battery. Dismantling 

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a battery can cause internal short-circuits. Gas, 
fi re, explosions and other problems can result.
The electrolyte and electrolytic vapors in LiIo-/LiPo 

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batteries are harmful. Absolutely avoid all direct 
contact with electrolytes. If electrolytes come 
into contact with skin, eyes or other body parts, 
immediately wash out or rinse out with generous 
amounts of fresh water then be sure to consult 

"compensation" for voltage differences between 
individual cells, by way of an otherwise typical 
balancer plug connection, is not necessary.
Under these conditions 

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Graupner LiIo-/LiPo 

batteries can be charged with a maximum of 2C 
(the value 1C corresponds to the cell capacity) 
charging current. At a voltage of maximum 4.2 V 
per cell and above, charging must continue a 
constant voltage of 4.2 V per cell until charging 
current drops below 0.1 … 0.2 A.
Charging voltage over 4.20 V per cell must be 

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avoided absolutely as the cell would otherwise be 
permanently damage and could cause a fi re. In 
order to prevent the over-charging of individual cells 
in a pack, a cut-off voltage between 4.1 V … 4.15 V 
per cell should be set to increase service life.
Never attempt to charge battery cells with the 

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wrong polarity. Abnormal chemical reactions take 
place when batteries are charged with reversed 
polarity and the battery will be useless. This can 
cause breaks, smoke and fl ames.
The permissible temperature range for charging 

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and storing LiIo-/LiPo batteries is 0 … +50 °C.
Storage: LiIo-/LiPo cells should have a 10 … 20 % 

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charge capacity when stored. If cell voltage drops 
below 3 V, then LiIo-/LiPo cells must absolutely 
be recharged to a capacity of 10 … 20 % of full 
capacity. Otherwise, further deep-discharging of 
the battery will make it useless during storage in a 
discharged state.

A continuous current rate of about 1C does not 

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represent a major problem for Graupner LiIo-/LiPo 
batteries. For larger currents, please follow the 
catalog specifi cations. In any case, observe the 
maximum current rating for the connector system, 
see maximum discharge current on the battery.