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The GOOLOO GT4000S is a portable lithium jump starter rated at 4000A peak, which GOOLOO says is enough for 12.0L gas and 10.0L diesel engines. It targets trucks, SUVs, RVs and heavy equipment rather than just sedans. It also has 100W fast charging, so it can top up its own battery and charge USB devices quickly. Against smaller 1000–2000A packs it is built for much larger engines, but it is heavier and bulkier than the pocket-sized starters aimed at compact cars.
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Lowest price we've seen: $99.99 on Nov 15 at Amazon. Tracked across 2 stores since Nov 15.
Owners rate it very highly and mostly describe it starting large engines on the first try and holding charge between uses. Complaints are few and tend to be about size and weight rather than performance.
The GOOLOO GT4000S is a portable jump starter for reviving dead car batteries. It delivers a 4000A peak current and can start gas engines up to 12.0L and diesel engines up to 10.0L. That covers vehicles such as trucks, SUVs, RVs and heavy-duty equipment.
It has 10 safety protections, including reverse-polarity, over-charge, over-voltage, short-circuit, extreme-temperature, over-current, over-load and reverse-charge protection, plus spark-proof technology. Software monitors power flow and battery status in real time.
The jump starter also works as a power bank. A 100W USB-C port charges in both directions and can power laptops. An 18W USB-A port charges phones and tablets, and a 15V/10A DC output powers larger devices. It recharges from empty to 100% in 1.2 hours. A 3-mode LED light offers spotlight, steady light and SOS strobe.
