Stanley J309 Jump Starter 300A 600 Peak Amps 12V Dc

Product Description

The STANLEY J309 is a portable jump starter designed to deliver 300 cranking amps and 600 peak amps to dead or discharged 12-volt lead acid automotive batteries. Built for roadside and shop use, it provides a reliable starting boost without the need for a second vehicle. The unit includes a built-in 120 VAC charger to recharge the internal battery from a standard wall outlet, a high-powered LED work light, and a power and charge indicator so the technician knows the unit is ready before connecting to a vehicle. All metal powder-coated clamps are included for durable, corrosion-resistant cable connections.

The J309 is suited for use on passenger vehicles, light trucks, and similar 12-volt DC starting systems using lead acid battery chemistry. The integrated 12-volt DC outlet and USB outlet make it a multipurpose tool for field service technicians, fleet maintenance crews, and mobile mechanics who need jump-start capability alongside portable power for accessories and devices. A reverse polarity alarm alerts the user to incorrect clamp connections before any current flows, reducing the risk of damage to vehicle electronics.

Key Features

• 300 cranking amps and 600 peak amps for 12-volt lead acid battery jump starts
• Built-in 120 VAC charger for recharging the unit from a standard wall outlet
• High-powered LED light for low-light work environments
• 12-volt DC outlet and USB outlet for powering accessories in the field
• Reverse polarity alarm to prevent incorrect clamp connections
• All metal powder-coated clamps for durability and corrosion resistance
• Portable design with a 8.75-pound package weight

Compatibility

Designed for use with 12-volt DC lead acid battery systems commonly found in passenger vehicles and light trucks.

Installation Notes

Jump starters are typically deployed by automotive technicians and fleet service professionals. Before connecting the clamps, confirm the vehicle ignition is off and identify correct positive and negative battery terminals. Connect the positive clamp first, then negative, following standard jump-start sequencing to reduce arc risk. If the reverse polarity alarm activates, disconnect immediately and verify clamp placement before proceeding.