Samsung ADH1800E Owner's Instructions Manual page 11

You must insert or replace the remote controller batteries when :
You purchase the air conditioner
The remote controller does not work correctly
N N o o t t e e Use two AAA, LR03 1.5V batteries.
N N o o t t e e
Do not use old batteries or different kinds of batteries together.
Batteries may be completely discharged after 12 months, even
if they have not actually been used.
Push the battery cover on the rear of the remote controller with your
thumb in the direction of the arrow and remove it.
Insert the two batteries, taking care to respect the polarities :
+ on the battery with + on the remote controller.
- on the battery with - on the remote controller.
Close the cover by sliding it back until it clicks into place.
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