GRAUPNER 6455, Manual

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the charge leads to the charger first, 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 

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.

•  Before charging please check:

 have you selected the appropriate charge output for the battery? 

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. 

•  Be careful! A battery could explode or burn, if the charger does have a fault or if the user 

does choose the wrong charging output and parameters. 

A-2. GENERAL NOTES ON USING THE CHARGER 

Charging batteries 

When a battery is charged, a particular quantity of electrical energy is fed into it. The charge quantity is 

calculated by multiplying charge current by charge time. The maximum permissible charge current 

varies according to the battery type, and can be found in the information provided by the battery 

manufacturer. 

It is only permissible to charge batteries at rates higher than the standard (slow) current if they are 

expressly

 stated to be rapid-charge capable. The STANDARD CHARGE CURRENT is 1/10 (one 

tenth) of the cells’ nominal capacity (e.g. for a 1.7 Ah pack the standard charge current is 170 mA). 

• 

Connect the battery to be charged to the charger output sockets using a suitable charge lead (red = 

positive terminal, black = negative terminal). 

• 

Be sure to read the information provided by the battery manufacturer regarding charging methods, 

and observe the recommended charge currents and charge times. Do not attempt to fast-charge 

batteries unless they are expressly stated to be suitable for the high currents which this charger 

delivers. 

• 

Please bear in mind that new batteries do not reach their full capacity until they have undergone 

several charge / discharge cycles. You should also be aware that the charger may terminate the 

charge process prematurely when connected to new packs, and batteries which have been deep-