Bedienungsanleitung Graupner ULTRA DUO PLUS 50 (Seite 73 von 117) (Deutsch)

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A-7. CLEANING AND MAINTENANCE

The charger is entirely maintenance-free in use, and requires no servicing of any kind. However, it is in

your own interests to protect the unit from dust, dirt and damp.

To clean the charger, disconnect it from the car battery and any other battery, and wipe it clean with a

dry cloth (don’t use cleaning agents!).

A-8. NOTES AND HANDLING OF RECHARGABLE BATTERIES

• Charging single Ni-Cd or Ni-MH cells, and packs consisting of 1 ... 4 cells, presents the automatic

charge termination circuit with a difficult task. The voltage peak is quite small in such cases, and it

cannot be guaranteed that the cut-off circuit will work reliably. In such conditions the automatic circuit

may not be triggered, or may not terminate the charge at the correct time. For this reason it is

important to carry out a series of monitored test charge processes with your packs in order to

establish whether the charge process is terminated reliably.

• Warm batteries offer much higher performance than cold ones, so don’t be surprised if your batteries

don’t seem so effective in the winter.

• Overcharging and deep-discharging batteries lead to irreparable damage to the cells, and

permanently reduces their maximum performance and effective capacity.

• Never store batteries for a long time in an uncharged, discharged or partially charged state. Charge

your batteries before storing them, and check their state of charge from time to time.

• When purchasing batteries we recommend that you buy good quality products exclusively. Start by

charging new packs at low rates, and work up gradually towards higher currents.

• Batteries should not be charged until shortly before use, as they are then able to deliver their best

performance.

• Do not solder directly to battery cells. The temperatures which occur during soldering can easily

damage the seals and safety valves of the cells. If this should happen, the battery may lose

electrolyte or dry out, and some of its potential performance will be lost.

• Charging any battery at high currents shortens the life expectancy of the pack. Don’t exceed the

maximum values stated by the manufacturer.

• Overcharging inevitably reduces the capacity of the battery, so do not recharge a hot pack, or one

which has already been charged.

• Charging and discharging any battery at a high current shortens the life expectancy of the pack.

Don’t exceed the maximum values stated by the manufacturer.

• Lead-acid batteries are not capable of being charged at high currents. Never exceed the maximum

charge rate stated by the battery manufacturer.

• Protect batteries from vibration, and do not subject them to mechanical stress or shock.

• Batteries can generate explosive gas (hydrogen) when on charge and when being discharged, so it is

important to provide good ventilation.

• Do not allow batteries to come into contact with water - explosion hazard.

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