We'd need some regulation for the regulations. My son's laptop battery died last week. Today, it is considered non-removable. But, he did remove it, after removing about 20 screws, carefully prying open the case, removing a few more screws and layers of insulation inside. Eventually, he was able to remove it and test that the battery was the fault and order a new one.
If we require labels, without the necessary strictly defined definitions, today's non-removable battery becomes tomorrow's "removable" battery. Because, hey, it is possible to remove it. Good luck getting everything back together if you aren't an engineer or extremely careful in how you disassembled things.
If a battery is "removable", that means replacing the battery is a normal, reasonable use of the device. Ergo, if the device breaks while the customer is replacing the battery, the manufacturer would need to replace it under warranty.
"Field replaceable" might be better way to describe it. If my flashlight runs out of power, I unscrew the tailcap, take out the 14500 cell, and put another one in it. I don't need tools and I can do it in the dark; it would be a major flaw for a flashlight if I could not.
If we require labels, without the necessary strictly defined definitions, today's non-removable battery becomes tomorrow's "removable" battery. Because, hey, it is possible to remove it. Good luck getting everything back together if you aren't an engineer or extremely careful in how you disassembled things.