Was using the fork lift at work yesterday when the battery died,being in a hurry I hooked the charger to it and went to lunch. When I returned just as I got the charger cables off there was a loud bang,a cloud of smoke and hot liquid on me.At first thought the battery exploded,here it was the coil,didn't know there was oil in those but I do now! Here the key was left on and it just kept getting hotter and hotter. No serious injury but learned why you don't get in a hurry and do things the proper way. Got a new coil and all is good now.