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The Stanley 15 Amp Battery Charger with 40 amp engine start is fully automatic. Vehicle won't start? Battery needs maintenance? Just connect the battery charger clamps to the battery terminal and press charge. The unit automatically selects charge rate and adjusts from rapid charge to trickle charge to maximize battery life.

Automatically selects charge rate to maximize battery life
40A patented engine start helps to start vehicle in approximately 90 seconds
Alternator check to to indicate potential alternator issues
Battery reconditioning technology can help reverse sulfate build-up on battery plates to improve charging carrying capability and extend battery life
LCD screen with easy-to-read icons
Reverse polarity protectio