A lithium cell in thermal runaway makes its own heat and its own oxygen. A firefighter spraying water onto it cools the surface, but the reaction inside carries on — which is why batteries reignite hours after being "extinguished".
The problem is not only the cell itself, but where it sits. E-bikes charge in the hallways of apartment blocks, in cellars, and in workshops where ten of them stand side by side. Nobody is there. Charging runs overnight.
In 2025 we covered two rooms totalling 140 m² at an e-bike service centre. The set: four MPH-2.8 modules and two TPS-01-72 sensors. The system waits for neither an operator nor a power supply — the sensor generates its own pulse once the temperature passes 72 °C and stays there for more than 20 seconds.
Powder does more than put out flames. It drops the temperature fast enough that the fire never develops into the neighbouring zone — and in a room with twenty batteries, that is the whole game. One cell in thermal runaway is a nuisance. Twenty cells is a destroyed building.
One more thing workshop operators tend to realise too late: hosing down a room full of electronics and chargers creates a second loss right behind the first. Powder is simply vacuumed up.
