It is a very tight squeeze. and the bottom of the cover has two or three plastic tenons that plug into matching holes in the bottom of the box. You have to open the top a little and then lift up and out. Definitely have to remove the battery first. And the bottom two clips are a real pia to get back on. Because of the bottom being tenoned in. I deemed my bottom clips unnecessary and omitted reinstalling them. Hope this helps, dave
