User manual

22
Important!
Only a battery pack with exactly the same voltage for each cell provides the maximum performance and
service life for a model airplane/vehicle.
Variations in the quality of the materials used and the internal structure of multiple-cell lithium battery packs
mean that the cells may have different voltages once discharged.
Charging such a rechargeable lithium battery without balancer will quickly cause large differences of cell
voltage. This not only shortens the operating life (as one cell may have a very low voltage), but also dam-
ages the rechargeable battery as a result of a total discharge.
When charging a rechargeable lithium battery with different cell voltages without a balancer, there is the
risk of overcharging one cell, which can lead to an explosion.
Example:
A dual-cell LiPo battery pack charged without the use of a balancer appears to have a voltage of 8.4 V and thus ap-
pears to be fully charged. The individual cells, however, have a voltage of 4.5 V and 3.9 V (one cell is dangerously
overcharged, the other half discharged).
A cell overcharged in this way may leak, expand or, in a worst case scenario, catch re or explode!
If this LiPo rechargeable battery is inserted, e.g. in a model plane, the ying time will be very short, since the voltage
of the half-charged cell will break down quickly and the rechargeable battery will not supply any current anymore.
If your rechargeable lithium battery has a balancer connection, it must be connected to the charger at all
times in addition to the two regular rechargeable battery connections (plus/+ and minus/-) (either directly or
via the balancer board); then use the charge programme "BALANCE".
d) Discharging Rechargeable Batteries ("DCHG")
Normally, it is not necessary to discharge lithium batteries (contrary to NiCd batteries) before charging. The battery
can be charged immediately, independent of its current status. If you want to discharge a rechargeable lithium battery
anyway, you can set the discharge current.
The maximum possible discharging current depends on the battery type, battery capacity and number of
cells. The max. discharge output of the charger is 5 W. This limits the max. possible discharge current of
rechargeable batteries with multiple cells.
Discharge a lithium rechargeable battery only to the minimum permitted voltage per cell (see table in
chapter 7 or observe information of the rechargeable battery manufacturer). If the rechargeable battery is
discharged any further, this deep discharge will permanently damage it and render it useless!
• First, choose the rechargeable battery type with the button "STOP" or "–" as described in chapter 11. a) (LiPo, LiIon,
LiFe or LiHv) and push the button "START".
• Select the rechargeable battery programme "DCHG" with the button "+"
or "–".
The upper left shows the rechargeable battery type, the upper right the
discharge end voltage per cell. The lower left shows the currently set
discharge current; the lower right shows the cell number ("3S") and the
associated total rechargeable battery voltage after discharge (cell number x
discharge end voltage per cell).
Use the button "+" or "–" to select a different rechargeable battery programme; use the button "STOP" to
return to the main menu.
LiPo DCHG 3.0V
1.0A 9.0V(3S)