NOTE: The battery is a maintenance free battery. Do NOT attempt to open a maintenance-free sealed battery
External Battery Charger Use
WARNING: WHEN AN EXTERNAL BATTERY CHARGER IS TO BE USED, CHARGING HARNESS MUST BE PLUGGED INTO A GROUNDED RECEPTACLE. IF RECEPTACLE IS NOT GROUNDED AND A MALFUNCTION SHOULD OCCUR, THE MACHINE COULD CAUSE SERIOUS ELECTRICAL SHOCK.
NOTE: Re-charge voltage should never exceed 14.7 volts and the load intensity shall be 0.2% of the value indicated below and on the lid of the battery.
Source: MaintainX (Community Member)