Notes On Handling Rechargeable Batteries - GRAUPNER SJ Ultra MFD 150 Instructions D'utilisation

The following types of battery must not be connected to the charger:
• NiCd- / NiMH batteries
• LiFe/LithiumPolymer batteries with more than 6 cells
• Batteries which require a different charge method from Lithium types.
• Faulty or damaged cells or batteries.
• Batteries consisting of parallel-wired cells, or cells of different types.
• Batteries consisting of old and new cells, or cells of different makes.
• Non-rechargeable batteries (dry cells). Caution: explosion hazard!
• Batteries which are not expressly stated by the manufacturer to be suitable for the currents which
this unit delivers during the charge process.
• Packs which are already fully charged or hot, or only partially discharged.
• Batteries or cells fi tted with an integral charge circuit or charge termination circuit.
• Batteries installed in a device, or which are electrically connected to other components.
To avoid short-circuits between the banana plugs fi tted to the charge leads, please always connect the
charge leads to the charger fi rst, and only then to the battery to be charged. Reverse the sequence
when disconnecting.
As a basic rule always check that the charge quantity is approximately the same as you expected
after the charger has indicated that the pack is fully charged. This is a simple method of detecting a
problem reliably and in good time, should the charge process be terminated prematurely for any rea-
son. The likelihood of premature termination varies according to many factors, but is at its highest with
deep-discharged packs, low cell counts and particular cell types which are known to cause problems.
We recommend that you carry out a series of test charges to satisfy yourself that the automatic termi-
nation circuit is working perfectly. This applies in particular when you are charging packs consisting of
a small number of cells. If the cells feature has a poorly defined voltage peak, the charger may fail to
detect the fully charged state. Fire / explosion hazard!
The charger is not capable of automatically detecting the battery type (e.g. LiPo or LiFe) connected to
it. Before charging please check: have you selected the appropriate charge program for the battery?
Have you set the correct charge or discharge current? Risk of fire - explosion!
Are all connections firm, or is there an intermittent contact at any point in the circuit? Please bear in
mind that it can be dangerous to fast-charge batteries. For example, if there is a brief interruption due
to an intermittent contact, the result is inevitably a malfunction such as a restart of the charge process,
which would result in the pack being massively overcharged. Fire / explosion hazard!
The slightest interruption in the charge process may allow the charge voltage to rise to the point where
it immediately ruins the transmitter. Fire hazard!

4. Notes on handling rechargeable batteries

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.
The voltage of LiIo / LiPo cells must never fall below 3.0 V per cell. Ignoring this will shorten
the effective life of your batteries.
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.
Operating Manual Ultra MFD 150
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