GRAUPNER mx-20 HoTT Bedienungsanleitung Seite 11

SAFETY NOTES AND HANDLING INSTRUCTIONS RELATING TO NICKEL-METAL-HYDRIDE RECHARGEABLE BATTERIES
As with all sophisticated technical products, it is vitally important that you observe the following safety notes and handling inst-
ructions if you wish the equipment to operate safely and reliably for an extended period.
Safety notes
• Rechargeable batteries are not playthings, and must be kept well away from children. Store rechargeable batteries out of the
reach of children.
• Check that the batteries are in perfect, serviceable condition before every use. Do not re-use defective or damaged batte-
ries.
• Rechargeable batteries must be used within the specifi ed limits stated for the corresponding cell type.
• Do not heat, incinerate or short-circuit rechargeable batteries, and never charge them with excessive currents or reversed
polarity.
• Never use rechargeable batteries consisting of parallel-wired cells, combinations of old and new cells, cells of different cons-
truction, size, capacity, make, brand or cell type.
• Batteries installed inside equipment should always be removed from the device when it is not in use and not about to be used.
Always keep equipment switched off in order to avoid deep-discharged cells. Batteries must be recharged in good time.
• The battery to be charged should be placed on a non-infl ammable, heat-resistant, non-conductive surface for the whole of
the charge period. Keep infl ammable and volatile objects and materials well clear of the charging area.
• Batteries must always be supervised when on charge. Never exceed the maximum fast-charge current specifi ed for the cell
type in use.
• If the battery heats up to more than 60°C whilst on charge, halt the charge process immediately and allow the pack to cool
down to about 30°C.
• Never recharge a battery which is already charged, hot, or not completely discharged.
• Do not make any modifi cations to batteries. Never solder or weld directly to cells.
• If incorrectly handled, rechargeable batteries are at risk of combustion, explosion, corrosive action and burns. Suitable extin-
guishing materials include fi re blankets, CO2 fi re extinguishers and sand.
• Escaped electrolyte is corrosive - do not allow it to contact skin or eyes. In an emergency rinse the area immediately with
plenty of clean water before seeking medical help.
• The cells' air vents must never be blocked or sealed, e. g. by solder. When soldering, the iron temperature should not exceed
220°C, and each joint should be completed in less than twenty seconds.
• To avoid cell deformation, do not exert excessive mechanical pressure on battery cells.
• If a battery should be accidentally overcharged, use the following procedure: Simply disconnect the battery and leave it on a
noninfl ammable surface (e. g. stone fl oor) until it has cooled down. Never hold the battery in your hand, as there is a risk that
cells might explode.
• Always observe the recommended rates for charging and discharging.
General information
The capacity of your rechargeable battery diminishes with every charge / discharge process. Stored batteries may eventually
exhibit reduced capacity.
Storage
Batteries should not be stored in a completely discharged state. Store them in a dry enclosed space at an ambient temperature
of +5°C to +25°C. If you are storing a battery for a period longer than four weeks, ensure that the cell voltage does not fall below
1.2 V Balancing individual battery cells
• To balance new battery cells, i. e. to bring them all to the same state of charge, charge them at what is known as the 'normal'
rate until they are full. As a general guideline a fully discharged battery needs to be charged for a period of twelve hours at a
current corresponding to one tenth of the capacity printed on the cell label (the "1/10C" method). After this treatment all the
cells will be fully charged, and exhibit the same voltage. This method of balancing battery cells should be repeated after
every ten fast-charge processes, so that the cells are repeatedly balanced; this helps to ensure an extended useful life for your
batteries.
• If you have the facilities to discharge individual cells, we recommend that you make use of this before every charge process.
Otherwise the battery pack should be run down to a discharge voltage of 0.9 V per cell. For example, this corresponds to a
fi nal discharge voltage of 3.6 V in the case of the four-cell pack used in the transmitter.
Charging
Ni-MH batteries should only be charged using the specifi ed currents, charge times and temperature range, and should be
supervised constantly when on charge. If you do not have access to a suitable fast charger, i. e. one which allows you to set
the charge current accurately, then the battery should always be recharged using the "normal" charge rate of 1/10C; see the
example stated above.
Wherever possible, transmitter batteries should always be recharged at the 1/10C rate, in order to avoid differences in cell states.
The charge current must never exceed the maximum permissible value stated in the transmitter instructions.
Fast charging
If your battery charger includes the facility to adjust the Delta Peak charge cut-off voltage, set this value to 5 mV per cell. Howe-
ver, most chargers are set to a fi xed cut-off value of 15 ... 20 mV per cell, which makes them suitable for use with both NiCd and
NiMH batteries. If you are not sure about this, please refer to the operating instructions supplied with your charger, or ask at your
local model shop whether your charger is also suitable for Ni-MH packs. If in any doubt, charge your batteries at half the stated