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The Stanley FatMax LJ25FC is a portable lithium jump starter rated at 2,500 peak amps, enough for cars and trucks up to V8 engines. It doubles as a power bank with 15W USB-A, 25W USB-C and 60W USB-C PD outputs, and adds a bright LED work light and reverse polarity protection. It comes with metal clamps, a smart cable controller and a two-pocket case. Against rival lithium packs it leans on high peak amperage and fast USB-C PD charging rather than extras like an air compressor or AC outlet. Owners rate it well overall, though some report units that arrived weak or failed early.
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Lowest price we've seen: $65.00 on Nov 8 at Walmart. Tracked across 8 stores since Nov 8.
Owners give it solid marks for starting power and the fast USB-C charging. A minority report dead-on-arrival or short-lived units, which pulls the average down.
The Stanley FATMAX LJ25FC is a portable lithium jump starter and USB power bank in a compact size. It delivers 2,500 peak amps of starting power for cars and trucks up to 8 cylinders. It works with AGM, GEL and WET 12-volt lead-acid batteries.
The unit comes with powder-coated metal clamps and a smart cable controller. Reverse polarity protection helps make sure the jumper cables are connected correctly. Status indicators show how much power remains in the internal battery.
As a power bank, it charges devices through a 15-watt USB-A port, a 25-watt USB-C port and a 60-watt USB-C PD port. A bright LED work light helps with repairs after dark. A 2-pocket carrying case is included.
