REICH U4 Mode D'emploi page 15

When connected to a battery, the charger detects the battery voltage
automatically. If the voltage is within the range of 7.5V to 10.5V then
the device switches to pulse charging mode. This pulse charging
phase will continue until the battery voltage rises above 10.5V. Once
this threshold is reached, the charger changes over to normal charging
mode selected by the user at the beginning. This feature, depending
on the initial condition, will improve the charge acceptance of a deep
discharged battery.
[6] PROTECTIONS AGAINST MISCONNECTION
The charger will turn off the electronic switch and resets the system
immediately to avoid damage whenever one of the following
abnormal conditions appears: short circuit, battery voltage below 7.5V,
open circuit or reverse polarity connection of the output terminals.
When reverse connection happens the LED ( ! ) will indicate the
mistake.
[7] TEMPERATURE PROTECTION
During charging, if the charger gets too hot for any reason it reduces
the output power automatically to protect itself from damaging. This
may lengthen the charging process.
4. Operation Instructions
Please read these instructions carefully before using the charger.
[1] This charger is designed for use on normal 220V – 240V 50/60Hz
circuit. It can be used to charge a variety of 12V lead acid batteries
widely used in cars, motorbikes and some other vehicles; WET, GEL,
AGM and so on, with a capacity ranging from 1.2Ah to 120Ah.
[2] Make sure you have a 12V Lead-Acid battery and read battery
user manual carefully.
[3] Clean the battery terminals. Take care to keep corrosion from
coming in contact with your eyes or skin.
[4] Be sure that the area around the battery is well ventilated during
charging process. When battery is being charged you may notice
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