GOOLOO GP4000 4000A Car Jump Starter Power Bank Review (2026)

What it is

GOOLOO's GP4000 is a 12 volt lithium jump starter rated for 4000 amps of peak current, positioned to cover all gasoline engines and diesel engines up to 10.0 liters according to the manufacturer. It uses a lithium polymer battery with a 24,000 milliamp-hour capacity, which GOOLOO says is enough for more than 60 jump starts on a single charge. Beyond jump-starting, it works as a power bank with dual USB outputs, one supporting fast charging, plus a USB-C port for both charging the unit and outputting power to devices. A built-in LED flashlight with steady, strobe and SOS modes adds emergency utility beyond the jump-start function.

Fit for the job

The 4000 amp rating puts the GP4000 well above what a typical car or small SUV needs, making it a better match for large trucks, diesel engines or cold-climate starts where more amperage helps overcome a sluggish battery. GOOLOO rates the pack for operation between negative 4 and 140 degrees Fahrenheit, which matters for campers who might need a jump start on a cold morning at a high-elevation site. Compared with the smaller GP2000, the GP4000 is a larger, heavier unit, which is a fair tradeoff for the extra amperage but makes it less ideal for someone who only drives a compact car and wants the smallest possible pack.

Features and specs

GOOLOO lists ten layers of protection on the GP4000, including safeguards against overcurrent, overload, overvoltage and overcharging, along with all-metal clamps designed to resist sparks and reverse-polarity mistakes. Recharging the unit takes about five hours through either the USB-C wall charger or a 12 volt car outlet, slower than some higher-wattage competitors but adequate for a tool that is not used daily. In the box, GOOLOO includes smart jumper cables, a USB-C cable, a cigarette lighter adapter and an EVA storage case, giving buyers a complete kit out of the box rather than just the bare jump starter.

Build and materials

Stepping up to 4000 amps means a larger internal battery and heavier-duty clamps than the GP2000, and the GP4000's housing reflects that with a bulkier, more rugged shape built to handle bigger cable runs and higher current without overheating. The lithium polymer cell inside is rated for a 24 month standby period, so it should still hold a usable charge after sitting unused in a truck console or garage shelf for an extended stretch. Like the GP2000, the overall fit and finish is aimed at value rather than the premium materials found on top-tier branded jump starters.

Value

Reaching 4000 amps from an established premium brand typically costs significantly more than the GP4000's price, which makes it a notably cheaper route to high-amperage jump starting for campers with large trucks or diesel engines. The obvious tradeoff is brand reputation and possibly long-term durability compared with a category leader, along with the practical reality that peak amp claims on budget packs are best treated as a ceiling rather than a number to rely on if the pack has been sitting uncharged for months. For someone who genuinely needs that much amperage and wants to spend meaningfully less to get it, the GP4000 remains a reasonable value choice overall.

Frequently asked questions