Tronic HG08139 Instructions D'utilisation Et Consignes De Sécurité page 35

Charging Time (min) =
Battery capacity (mAh) x 1.4 x 60:
Charging current of the product (mA)
Automatic charging control/Retention charging
This product controls the charging time for Ni-MH and Ni-Cd re-
chargeable batteries separately.
This control is based on the –Δ V ("Minus Delta V") calculation. In
mathematics, with Delta Δ differences are indicated. In this case,
"Minus Delta V" means a negative voltage difference. This charge
identification makes itself useful in the following effects: Should a re-
chargeable battery be charged with a constant current, its voltage
rises continuously. When a rechargeable battery is full, its voltage
reaches a maximum but falls again slightly with further current flow.
This light fall in voltage is recognised by the charging electronics and
the charge process is terminated. The product automatically switches
to "Retention charging". This means that the batteries are no longer
being loaded with constant current, instead, with short current pulses.
This counteracts the selfdischarge and the batteries are kept in a state
of full charge.
Timer control
In addition, this product has a timer control which automatically switches
over to retention charging after 17 hours. This serves as an additional
protection against overcharging should the charge termination not re-
spond due to a possibly defective rechargeable battery.
GB/IE 35