TOHATSU BFT 250A Owner's Manual page 102

<Battery Cleaning>
1. Disconnect the battery cable at the
battery negative (+) terminal, then
at the battery positive (–) terminal.
2. Remove the battery and clean the
battery terminals and battery cable
terminals with a wire brush or sand
paper.
Clean the battery with a solution of
baking soda and warm water,
taking care not to get the solution
or water in the battery cells. Dry
the battery thoroughly.
POSITIVE (+)
–
NEGATIVE ( )
TERMINAL
TERMINAL
3. Connect the battery positive (+)
cable to the battery positive (+)
terminal, then the battery negative
(–) cable to the battery negative (–)
terminal. Tighten the bolts and nuts
securely. Coat the battery 
terminals with grease.
MAINTENANCE
When disconnecting the battery
cable, be sure to disconnect at the
battery negative (–) terminal first.
To connect, connect at the positive
(+) terminal first, then at the
negative (–) terminal. Never 
dis/connect the battery cable in the
reverse order, or it causes a short
circuit when a tool contacts the
terminals.
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