GRAUPNER micro Koala 460 indoor Manuel D'instructions page 22

micro Koala 460
indoor
Instructions and warnings relating to the use of LiPo batteries:
General information
Lithium-Polymer (abbreviation: LiPo) batteries require particularly careful handling. This applies to charging
and discharging techniques, and also to storage and other aspects of general handling. Special measures
must be observed, and these are outlined below.
Mishandling these batteries may lead to explosions, fire, smoke and a risk of poisoning. In addition to these hazards ig-
noring our instructions and warnings will result in loss of battery performance and other problems.
The capacity of a LiPo battery declines every time you charge or discharge it. Storing these batteries at excessively
high or low temperatures may also cause a gradual reduction in capacity. In typical modelling usage these batteries will
be subject to high discharge currents and motor induction currents, with the result that their capacity will fall to around
50 - 80% of the capacity of a new battery after 50 charge / discharge cycles even if you observe all the charge and dis-
charge requirements.
Don't series- or parallel connect battery packs since the cell capacities and the charging condition may be too different.
Therefore, battery packs we supply, are selected.
Store these instructions in a safe place, and if you ever sell this unit be sure to pass the instructions on to the new
owner.
Special notes regarding the charging of Graupner LiPo batteries
For the charging of LiPo battery packs use only the licensed chargers with their corresponding connecting leads. Any
manipulation of the charger or of the charging lead may cause serious damages. By means of the charger you have the
full and absolutely imperative control of each single cell of the battery pack.
The battery to be charged must be placed on a non-flammable, heat resistant and non-conductive surface.
Keep inflammable and volatile materials well away from the charging area. Batteries must not be left on charge
unsupervised.
LiPo batteries should only be charged and discharged using Graupner chargers / dischargers specially de-
signed to cope with them, e.g. the Graupner LiPo charger 4 (Order No. 6437), LiPomat 4 Plus (Order No. 6438),
Ultramat 10 (Order No. 6410), Ultramat 12 (Order No. 6412), ULTRA DUO PLUS 30 (Order No. 6416) (in Li-Io or
Li-Mn or Li-Po mode (new)) or GMVIS Commander with software version V2003 or later (Order No. 94401).
Take care to set the correct cell count, final charge voltage and final discharge voltage. Be sure to read the op-
erating instructions supplied with your charger / discharger before using it with LiPo batteries.
The white plug with more as two poles (number of cells + 1) is used for the charger Order No. 6438 or for the
LiPo-balancer Order No. 6491 and also for single cell charging to balance the cells manual.
An adaptor cable (sold separately) may be necessary for some batteries to be connected to some chargers /
balancers.
The basic rule is that LiPo batteries consisting of multiple cells wired in series may only be charged as a pack if the
voltage of the individual cells does not differ by more than 0.05 V. If the difference in voltage between individual cells is
more than 0.05 V the cells must be charged or discharged individually until the voltage of the cells is as nearly as pos-
sible identical.
Provided that these conditions are met, Graupner LiPo batteries can be charged at a rate of max. 2C (1C corresponds
to the cell capacity). When the pack reaches a voltage of max. 4.2 V per cell, charging must continue at a constant
voltage of 4.2 V per cell until the charge current falls below 0.1 - 0.2 A.
It is essential to avoid cell voltages above 4.25 V, as higher voltages cause permanent damage to the cells and
cause fire.
The maximum charge capacity must be limited to 1,05x of the battery capacity. Example: 700mAh battery = 735mAh
max. charge capacity.
At the end of each charge process you should check the voltage of the cells in the pack to establish whether any one of
them is higher than 4.2 V. Ideally all cells should exhibit the same voltage. If the voltage of the individual cells differs by
more than 0.05 V, charge or discharge the cells individually to balance cell voltages. After a long period of usage indi-
vidual cells may exhibit greater differences, and these should then be charged singly to avoid overcharging the cells in
the pack.
Take great care never to charge these batteries with reversed polarity. If batteries are charged with reversed polarity
abnormal chemical reactions take place, causing cell ruptures, smoke and flames, and the battery gets useless.
The permissible range of temperature during the charging and storing of LiPo batteries is from 0 – 50° C.
Storing: LiPo cells should be stored with a charged capacity of 10 – 20 %. If the voltage of the cells go down under 3
V, it is absolutely imperative to recharge them (10-20 %). Deep-discharging and storing in a discharged condition (cell
voltage under 3 V) render the battery useless.
Special notes regarding the discharging of Graupner LiPo batteries:
Graupner LiPo batteries can safely be discharged at continuous currents of around 6C without major problems. If you
wish to use higher currents please read the information stated in the catalogue.
Discharging these batteries to a point below 2.5 V per cell causes permanent damage to the cells, and this
must therefore be avoided at all costs. You can avoid this by switching off the motor as soon as you detect a
noticeable power loss. Be aware of the danger of packs consisting of cells which have been charged to differ-
ent levels, as the speed controller's low voltage cut-off may then be triggered too late, with the result that indi-
vidual cells might be discharged too deeply and suffer permanent damage.
Do absolutely avoid short-circuits. Permanent short-circuits cause a destruction of the battery, high tempera-
tures and self-inflammation may be the consequence.
The battery temperature during the discharging should in no case exceed 70° C.
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