Aqara P1 Manuel D'utilisation page 10

2.Install two brand-new CR2450 button batteries into the
battery compartment, with one firmly sticking the
compartment top on the polar front and the other firmly
sticking to the compartment bottom on the polar front.
3.Align to and install the battery compartment based on
arrow directions, and then put on the battery cover.
Alignment of
battery
compartment
Alignment of
battery
compartment
07
Alignment of
battery cover
Alignment of
battery cover