Case WX145 Operator's Manual page 215

SECTION 4
Quick recharge
Respect the prescriptions of the Manufacturer of the
battery charger.
Before performing the quick recharge, that is, a
recharge with high density voltage, disconnect both
connecting cables and disassemble the batteries.
Before performing the battery charge, unscrew the
plugs to allow the release of gas from all battery
cells.
A flat battery can freeze already at -10 °C (14 °F). If
the battery is frozen, it must absolutely be defrosted
before quick recharge; otherwise it could explode.
The battery charger net cable has to be plugged-in
to the electric socket, only after the battery charger
clamps have been correctly connected to the battery
poles.
red = positive
black = negative
Once the recharge is complete, reinstall the battery
and perform correct connection (first the positive
pole and than the negative).
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