TechniSat VIOLA 2 Mode D'emploi page 19

There is an explosion hazard if a battery is inserted incorrectly.
Only replace batteries with the correct type of batteries and the correct model
number.
Caution! Do not expose batteries to extreme conditions.
Do not place them on radiators, or expose them to direct sunlight.
Leaking or damaged batteries can cause burns if they come into contact with the
skin. In this case use suitable protective gloves. Clean the battery compartment
with a dry cloth.
If the device is not being used for a prolonged period, remove the batteries.
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