Thirty seven incidents of exploding lead acid batteries at coal mines, metalliferous mines, and quarries have been reported to the Mines Inspectorate over the last 11 years - an incidence rate of 3.4 per yea. Battery explosion incident reports show that in mobile plant and vehicle applications, VRLA. This bulletin cannot account for all possible battery applications, but if a battery application is about to be introduced or changed, a proper management process, taking into accou. 5.1. MechanismH2 and O2 gases are produced inside the battery casing during charging, and when almost fully charged, the H2 and O2production rat.