The chemistry would be significantly different, I doubt you could recharge these.
Many things are dangerous when mishandled, but safe when handled properly. In your house, you likely have oxidizing agents that could cause explosions if mixed with the right reducing chemicals (bleach). You might have high molar acids (battery acids, hydrochloric for pool or driveway cleaning), as someone else mentioned before, you probably sit a couple feet from a hydrocarbon which if atomised, could become a high explosive.
Treat lithium ion in accordance with manufacturer's advice, and you will probably have more risk from a heater catching fire than your battery catching fire.