... Sometimes, if you're lucky, it will pop open just by prizing with a screwdriver...

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And I second this pleasant thought by MacMan. Those two little tab things at the top front lip are just the place to start prying, unlatching the cover lip then working towards the left and right sides. I got lucky and my case split open along the seam line quite nicely. There is some double sided adhesive stuck lengthwise to the underside of the top cover that adheres to the two innermost rows of batteries, this is just overcome by prying with a putty knife as the batteries topside are cardboard sleeve insulated and all the electronics is underneath the batteries bottom side. You can go in 2 inches in the middle of the topside, it's all insulated. No putty knife prying or deep knife cutting at either extreme end: this is where the bare solder tabs are exposed! If you cut, limit penetration to .080 inches and break the rest free with prying.