The base plate can be taken down with 2 fingers counterclockwise mount with 2 screws on the smoke detector insert the battery (otherwise the part goes up for safety reasons!) Then turn off the smoke detector again sit on and clockwise. On the housing is even a small nose so you know how you have to start to turn.
Negatives:
In one of the 4 battery was immediately empty. Damage, a replacement battery will cost 5 euros in fiscal around the corner, makes more than 50% of product value. Amazon offered me 1 Euro or should I send the item back (also a bit tedious ...).
The problem is likely lt batteries are more common. Various reviews.
EDIT:
Sorry to cut down on 1 star ... Meanwhile, a second smoke detector has announced that the battery is empty. So I got to 4x 5 Euro new alkaline batteries purchased, installed and? Nothing .. 2 beeping still every few minutes in front of him and my battery are empty ....
EDIT 2:
Thus, the third of 4 beeps every few minutes time. Returning now purchased at Amazon, and others. Good tip: only buy smoke detectors with the Q-label! [...]
