Craftsman 934.716140 Owner's Manual page 12

PROVIDE REQUIRED POWER
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T.o reduce risk of electric shock and fire, never alter the AC
powercord or powercord plug provided on the charger. Never
alter extension cords or extension cord plugs. Make sure the
extension cord isproperly wired and in good electrical condition.
Make sure thewire s_ze (American Wire Gauge or AWG) of the
extension cord is large enough to handle your specific charger!s
amperage requirements as specified in the following table:
MINIMUM AWG (American Wire Gauge) EXTENSION CORD
REQUIREMENTS FOR SEARS BATTERY CHARGER #71614
Length of Extension Cord in Feet
25 Ft, 50 Ft. 100 Ft. 150 Ft.
18 Ga. 18 Ga. 16 Ga. 14 Ga.
Gauge of Wire Required
10