At charging of rechargeable batteries explosive mix of gases is emitted.
During the work with wires and electric devices smoking, use of fire, the sparking devices opened by fire-dangerous light devices is forbidden. Avoid emergence of sparks at the address with wires and electric devices.
Never close directly the battery plug — there is a big danger of getting injured because of strong sparking.
At a detachment of the rechargeable battery disconnect from the onboard power supply network of the car at first "minus" a wire, and then "plus". At the working engine it is impossible to disconnect the battery as, in this case electronic devices of system of electric equipment will be damaged.