Notes On Handling Rechargeable Batteries - GRAUPNER ULTRA DUO PLUS 80 Bedienungsanleitung

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 reason. 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 termination 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 NiMH) 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

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.
Fire / explosion hazard!
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 NiMH cells should never be allowed to fall below 1.2 V per cell, and 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.
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Operating Manual ULTRA DUO PLUS 80