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c) Charging the battery with balancer ("BALANCE")
Unlike the simple "CHARGE" battery program (see Chapter 11. b), the battery program "BALANCE" monitors the
voltage of each individual cell in a multi-cell lithium battery and corrects any deviations accordingly.
Besides the normal two battery terminals (plus/+ and minus/-), the balancer port of the battery must also be connec-
ted to the charger.
The balancer connector of the battery can be either plugged directly into the charger or connected via the provided
balancer board (depending on the design).
If the balancer connector of the battery is plugged directly into the charger, you need to pay attention to the correct
polarity. The negative terminal of the balancer connector usually features a black wire. This side of the balancer
connector must show in the direction of the "-" on the charger's balancer socket and of course you need to plug it
also onto this pin.
If you use batteries you assembled yourself, the balancer plug must be allocated correctly.
The black wire is the negative pole of the first cell. The connector pin that follows is the positive pole of the
first cell; the successively following connector pins are the positive poles of the second, third, fourth, fifth,
sixth, seventh and eighth cell (depending on the number of cells).
Thus the last connector pin of the battery's balancer plug is the positive terminal of the last cell. That way you
can measure the same voltage between the two outer pins of the balancer plug in the same way as on the
two battery terminals.
The remaining part of the charging procedure is described in Chapter 11. b).
If a lithium battery with balancer plug is connected to the charger, you can toggle between the voltage indica-
tions of individual cells by pressing the "INC" button. Briefly press the "ENTER/START" button to return the
charger to the normal display.
Important!
Only a battery pack with exactly the same voltage per cell delivers maximum performance and operating
time for a model airplane/car.
Due to variations in the quality of materials and the internal structure of, for example, a multi-cell lithium
battery pack, it can turn out that the cells will have a different voltage at the end of discharge.
If you charge such a lithium battery without balancer, huge differences in the voltages of cells will appear
very quickly. Not only does this result in a shorter service life (due to voltage drop in a cell), but the deep
discharge will also damage the battery.
Furthermore, charging a lithium battery with different cell voltages without balancer poses the risk of
overloading an individual cell.
Example:
On the surface, a LiPo battery pack with 2 cells which is charged without balancer has a voltage of 8.4V and thus
appears fully charged. However, the individual cells have a voltage of 4.5 V and 3.9 V (one cell is dangerously
overloaded, the other half empty).
Such an overloaded cell can leak, swell or in the worst case catch fire or explode!
If this LiPo battery is used in a model aircraft, the flight time will be very short, because the voltage of the half-empty
cell will drop quickly and the battery will no longer supply any power.
If your lithium battery has a balancer connection, always connect it to the charger (either directly or
through the balancer board) in addition to the normal two battery terminals (plus /+ and minus/-); then use
the charge program "BALANCE".
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