How to change the battery in a chirping hardwired fire alarm?

Comparing the fire alarm to the manufacturer's website, the fire alarm is a model 7010. http://www.brkelectronics.com/products/hardwired/smoke-alarms



There's something that resembles a battery compartment, but I can't open it. How do I open it to change the battery? Thanks.How to change the battery in a chirping hardwired fire alarm?
Of course it has a battery backup. A smoke alarm would be pretty useless if it didn't work when the power went off. The advantage of hard wired is just a much longer battery life.

That unit it kind of hard to replace the battery in. You'll need the detailed instructions in the manual.

http://www.brkelectronics.com/pdfs/2008/How to change the battery in a chirping hardwired fire alarm?
It doesn't have a battery. ';Hard wired'; means it's wired to 110 volts. 'Must have a problem in the circuitry of the alarm itself.



Good luck.