Jomgand K25 Portable 3750A Car Battery Jump Starter — 9.0L Gas / 7.0L Diesel, Power Bank & LED

The Jomgand K25 is a compact 3750A peak portable jump starter that can start 12V vehicles up to 9.0L gasoline or 7.0L diesel and also serves as a power bank and LED emergency light.

The K25 combines a high-amp jump starting module with smart safety features and multi-port charging in a rugged, pocketable package. Designed for drivers, fleet operators, and outdoors users, it displays real-time voltage, protects against reverse polarity, and supplies USB and 12V outputs for charging phones and accessories. Below are common buyer questions answered clearly so you can see whether the K25 fits your needs.

How powerful is the K25 for starting large engines?

The K25 delivers a 3750-amp peak current specifically tuned to revive 12V automotive batteries. It’s rated to start gasoline engines up to 9.0 liters and diesel engines up to 7.0 liters, making it suitable for many cars, trucks and SUVs.

• 3750A peak current for quick cranking under low voltage.
• Supports up to 9.0L gasoline and 7.0L diesel engines.
• One-button boost start for straightforward use.

What safety systems protect me and the vehicle?

Safety is managed by ten protection technologies inside the K25, reducing risk when connecting to a vehicle battery. Smart clamps monitor connection status and will alert or prevent operation if a fault is detected.

• Built-in protections: over-charge, over-current, short-circuit, and over-voltage.
• Reverse polarity and reverse-charge prevention to avoid misconnection damage.
• Spark-proof design and temperature protections for safe handling.

Can the K25 power devices and flash as an emergency light?

Yes. The K25 doubles as a power bank with USB-A and USB-C outputs (3.0A) plus a 12V DC output for accessories. Its integrated LED offers three modes—steady, strobe and SOS—to signal for help or light work areas.

• USB-A and USB-C 3.0A ports for fast phone and tablet charging.
• 12V DC output for in-vehicle accessories or small electronics.
• Built-in LED with flashlight, strobe and SOS for roadside emergencies.

How does the K25 communicate battery status and faults?

The K25 includes a large digital display that continuously shows vehicle voltage, remaining unit power, clamp connection status and error alerts. This makes it easier to diagnose a weak battery versus an accessory fault before attempting a jump.

• Real-time vehicle battery voltage on the smart screen.
• Accurate internal battery percentage so you know available cycles.
• Clear fault alerts and clamp status to guide safe operation.

Who is this for? The Jomgand K25 is aimed at motorists who want a reliable, all-in-one roadside tool: drivers of mid- to large-displacement gasoline and diesel vehicles, fleet managers, tow operators, RV and boat owners, and outdoor enthusiasts who need dependable jump-start power plus portable device charging. If you value straightforward one-button starting, visible diagnostics, and layered safety protections in a compact pack, the K25 offers a balanced mix of power and convenience. Remember to keep the unit charged above 30% before use and recharge it every six months after use to preserve battery life. In the box you’ll receive the K25 jump starter, smart jump cable, USB charging cable, and a user manual, along with access to 24/7 customer support for any questions.