Halo Bolt 57720
The Halo Bolt 57720 is our flagship portable jump starter and power bank, engineered to get you out of emergency situations fast. With 57,720 mWh of battery capacity, this compact unit delivers enough power to jump-start gas engines up to 6.0L and diesel engines up to 3.0L — all without needing another vehicle.
We designed the Halo Bolt 57720 for drivers who demand reliability and versatility. Beyond jump-starting, it functions as a high-capacity USB charger for smartphones, tablets, and laptops, keeping you powered through road trips, camping adventures, or power outages. The integrated LED floodlight and emergency strobe ensure you’re prepared for any roadside situation, day or night.
Power & Performance Specs
Battery Technology & Jump-Starting Power
The Halo Bolt 57720 uses premium lithium-ion cells that maintain their charge longer than traditional lead-acid jump starters. Our testing confirms it can hold a charge for up to six months in storage, so it’s ready when emergencies strike.
The 57,720 mWh capacity translates to roughly 30 jump starts for a standard sedan before needing a recharge. Peak current output reaches 1000A, delivering the instant surge needed to crank stubborn engines in cold weather. Smart circuitry monitors voltage and temperature throughout the jump-start process, automatically shutting off if unsafe conditions are detected.
USB Charging Capabilities
Beyond jump-starting, the Halo Bolt 57720 serves as a high-capacity portable charger for all your devices. The dual USB ports include one 2.4A output optimized for tablets and one 1.0A port perfect for smartphones and accessories.
With its massive battery capacity, you can fully recharge an iPhone 8-10 times or an iPad 2-3 times before the unit needs replenishing. We’ve tested it with laptops, Bluetooth speakers, cameras, and GPS units — any USB-powered device charges reliably. The smart charging circuitry detects your device and delivers the optimal current for fast, safe charging.
Integrated AC Charging & Portability
One of our favorite design features is the built-in AC wall plug. Instead of hunting for a charging cable, you simply flip out the integrated prongs and plug the Halo Bolt 57720 directly into any standard wall outlet. A full recharge takes approximately 5-6 hours from empty.
This cable-free charging system means one less thing to pack and lose. The compact 6.5″ × 3.25″ × 1.5″ footprint fits easily in glove boxes, center consoles, or backpack side pockets. At just 1.25 pounds, it’s lighter than most traditional jump starters while delivering comparable power.
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Common Questions About the Halo Bolt 57720
On a full charge, the Halo Bolt 57720 can typically jump-start a standard sedan 25-30 times before needing to be recharged. Larger engines or extremely cold weather may reduce this number slightly.
The actual count depends on your engine size and battery condition. We recommend recharging the unit after every 3-4 jump starts to ensure it’s always ready for emergencies.
The Halo Bolt 57720 jump-starts diesel engines up to 3.0L displacement. For most diesel passenger cars and small trucks, this provides ample power.
If you have a larger diesel engine — such as a 6.7L heavy-duty truck — we recommend stepping up to the Halo Bolt 58830, which delivers higher peak current for bigger displacement engines.
Using the built-in AC wall plug, a complete recharge from empty takes approximately 5-6 hours. The LED indicator glows red during charging and turns green when fully charged.
You can also recharge it via USB-C input (cable not included) in about 4 hours using a high-wattage USB-C charger. We recommend recharging every 3-6 months even if not used to maintain optimal battery health.
Yes, the halo bolt 57720 operates safely in temperatures from -4°F to 140°F, making it suitable for year-round vehicle storage in most climates. Extreme heat or cold may reduce peak performance temporarily, but won’t damage the unit.
For longest battery life, we recommend storing it in a location that avoids prolonged exposure to temperatures above 120°F, such as a glove box rather than on the dashboard. Check and recharge it every 3-6 months.
The Halo Bolt 57720 includes multiple safety systems. Reverse polarity protection detects if you connect positive to negative and sounds an alarm while refusing to engage. Spark-proof technology prevents arcing even if clamps touch together.
Additional protections include overcharge shutoff, short-circuit prevention, and over-temperature monitoring. The smart clamps make it nearly impossible to damage your vehicle’s electrical system, even if this is your first time jump-starting a car.
The USB ports remain functional at all times, but we recommend not charging devices during an active jump-start. The unit prioritizes delivering maximum current to your engine during the jump.
Once your engine is running and you disconnect the jumper clamps, you can immediately resume charging phones, tablets, or other USB devices without any issues.
The Halo Bolt 57720 features a four-LED battery indicator on the side. Press the power button to check remaining charge — four lit LEDs indicate full capacity, while one blinking LED means it’s time to recharge.
We recommend recharging when the indicator shows two LEDs or fewer to ensure you always have enough power for an emergency jump-start. The unit can sit unused for up to six months and still retain sufficient charge for most jump-starting needs.