Duracell Digital inverter 400 Owner's Manual page 19

WARNING: Shock hazard
Batteries contain corrosive materials and present an electrical shock
hazard. To prevent irritation and burns, wear protective eyewear and
clothing when you install the inverter or work with the batteries. Take
special care to ensure that metal tools and personal metal objects like
rings and bracelets do not contact the battery terminals.
Follow these steps to make a direct battery connection:
1. Place the inverter on a flat surface.
2. Make sure that the unit is off by verifying the digital display is off.
CAUTION: Reverse polarity
Power connections of the 12 V DC battery to the Inverter must be
positive to positive and negative to negative.
A reverse polarity connection (positive to negative) will blow a fuse in
the inverter and may permanently damage the unit. Damage caused by a
reverse polarity connection is not covered by your warranty.
3. Connect the ring terminals on the DC cable clamps to the cabling
terminals on the unit. (The cabling terminals are shown in Figure
2.) Fasten the positive (red) ring terminal to the positive cabling
terminal, and then fasten the negative (black) ring terminal to the
negative cabling terminal.
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