SAFE:electrician take care of removing the cover of battery

what battery I need to buy for the above burglar alarm so I have it on hand for the electrician to install. Also how do you get the cover off?

A experts says that:
I suggest you allow the electrician take care of removing the cover. When my wife does these things, I end up replacing it...... Now I am sure you are not the same way, but to be on the safe side allow the electrician to do it.

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