Is the internal battery replaceable?

No. In the case of a faulty internal battery, the entire unit itself would be replaced under warranty.

Since this supports over 5000 amps, can it be used for spot welding?

I have used two of the 155 in a series to weld Worked great just won’t weld for very long before they run down Have to hold the safety over ride down to turn on if no polarity recognized. Same as a completely dead battery

How long does it take to charge full?

The GB250 takes approx. 8.5hr to charge at 56W

Deliver to Greece

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NOCO Boost Max GB250: 5250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables - for 16L Gas and Diesel Engines

NOCO Boost Max GB250: 5250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables - for 16L Gas and Diesel Engines

Product ID: 337101553

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Details

Brand
NOCO
Product Dimensions
19.49"D x x
Item Weight
21.6 Pounds
Amperage
5250 Amps
Peak Output Current
5250 Amps

⚡5250A peak amps

🔋12V lithium battery tech

🔦600-lumen LED flashlight

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Description

⚡ Power up like a pro—never get stranded, always stay charged!

COMPACT YET MIGHTY - Only 21.6 lbs but built to replace bulky units—engineered for heavy-duty trucks, buses, and industrial machines.
ULTRA SAFE SMART TECH - Patented spark-proof & reverse polarity protection for foolproof, professional-grade safety every time.
UNMATCHED POWER SURGE - 5250 amps to jumpstart engines up to 16L gas & diesel—commercial-grade muscle in a compact frame.
ILLUMINATE ANY EMERGENCY - 600-lumen LED with 7 modes including SOS & strobe—your ultimate roadside companion after dark.
ALL IN ONE PORTABLE POWER - Doubles as a power bank with fast 4-hour recharge, keeping your devices charged on the go.

The NOCOBoost Max GB250 is a commercial-grade 12V lithium jump starter delivering a massive 5250 amps to start gas and diesel engines up to 16L. Featuring patented spark-proof and reverse polarity protection, it ensures ultra-safe, mistake-free use. This portable powerhouse also functions as a fast-recharging power bank and includes a 600-lumen multi-mode LED flashlight, all packed into a compact 21.6-pound design trusted by professionals worldwide.

Specifications

Brand	NOCO
Product Dimensions	19.49"D x 14.17"W x 9.8"H
Item Weight	21.6 Pounds
Amperage	5250 Amps
Peak Output Current	5250 Amps
Specification Met	UL
Manufacturer	NOCO
UPC	046221190403
Global Trade Identification Number	00046221190403
OEM Part Number	GB250
Automotive Fit Type	Universal Fit
Model	GB250
Item Weight	21.6 pounds
Item model number	GB250
Batteries	1 Lithium Ion batteries required.
Exterior	Machined
Manufacturer Part Number	GB250
Bulb Type	LED
Special Features	5,250A 12V Commercial Jump Starter, Lithium Powered Jump Starter, Spark-Proof and Reverse Polarity Protection, Works On Gas and Diesel Engines

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