Modern laptop batteries aren't dumb chunks of lithium. They've got a microprocessor stuck on them that talks to the laptop itself, doing useful stuff like checking power levels and monitoring the heat of the battery. According to Miller, however, the, and all have chips that ship with a default password.
Once you know that password, it's possible to wreak all manner of havoc on a computer's battery. Bricking the battery, making it completely useless, is apparently a simple procedure.
You could also stick some malware on the microprocessor that would infect the computer time and time again. "You could put a whole hard drive in, reinstall the software, flash the BIOS, and every time it would reattack and screw you over. There would be no way to eradicate or detect it other than removing the battery."
Miller also reckons it might be possible to remotely explode a laptop battery, though he hasn't tried that personally. "I work out of my home, so I wasn't super inclined to cause an explosion there," he said.
What a cowaReasonable enough. Miller will be demonstrating how to hack a battery microprocessor at the Black Hat conference in Las Vegas next month, and he'll also be releasing a tool for MacBook users called 'Caulkgun' that will change battery firmware codes to something more complex than the default password, protecting them from attack.
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