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Our house alarms are hinged at the bottom and the catch is at the top. To open them we just grip the outer case at the top and give a quick tug. The lid then drops out and down to reveal the alarm and battery box.

Try testing the alarm by pressing the button in the middle! It's not very likely to be rechargable.

Its prob stopped as the van has got warm and put a little charge in it (remember when you used to put your batteries on the rad when you were young!).

Sounds like it needs to be replaced.

Ta for all your replies.  Turns out I was giving duff info (sorry).  It's the gas alarm which is a separate item to the smoke alarm (doh, didn't realise the smoke alarm was at the top of the 'wall' panel whereas this is about 3 or 4 inches off the floor). It's actually wired in - not sure if there's a battery in it or not.  It behaved itself while we were away so fingers crossed all ok again.  Only issue we had was the dog decided to curl up on the doormat and leaned on the test button.  I know collies are clever but I didn't think she'd do a safety check before she settled down for the night