Lithium-Ion batteries can be really dangerous. I'm a little surprised noone has been killed by a cell phone. And computer notebooks can be much worse.

A *LOT* of engineering goes into battery safety. No way does Motorola overlook that. I bet either the owner bought a cheap battery elsewhere or that Motorola's Brazilian importer was using fakes to pocket the cash difference. Motorola may just have to seal the battery into the phone at the factory and make it a non-replaceable item.

Computer notebook batteries have processors in them than the notebook can talk to. The notebook can reject a battery that doesn't have the right IDs but counterfeits may become a problem. A notebook battery can easily send everyone nearby to the hospital (in the 1990s an engineer across the hall had a prototype explode one night and I helped dig the shrapnel out of the walls and furniture the next day).