NOCO Genius BOOST MAX GB251+ User Manual

User Guide & Warranty
DANGER
READ AND UNDERSTAND ALL SAFETY INFORMATION BEFORE USING THIS PRODUCT.
Failure to follow these safety instructions may result in ELECTRICAL SHOCK, EXPLOSION,
FIRE, which may result in a SERIOUS INJURY, DEATH, or PROPERTY DAMAGE.
Electrical Shock. Product is an electrical device that can shock and cause serious injury. Do not cut
power cords. Do not submerge in water or get wet.
Explosion. Unmonitored, incompatible, or damaged batteries can explode if used with product. Do not
leave product unattended while in use. Do not attempt to jump start a damaged or frozen battery. Use
product only with batteries of recommended voltage. Operate product in well ventilated areas.
Fire. Product is an electrical device that emits heat and is capable of causing burns. Do not cover
product. Do not smoke or use any source of electrical spark or fire when operating product. Keep
product away from combustible materials.
Eye Injury. Wear eye protection when operating product. Batteries can explode and cause flying debris.
Battery acid can cause eye and skin irritation. In the case of contamination of eyes or skin, flush aected
area with running clean water and contact poison control immediately.
Explosive Gases. Working in the vicinity of a lead-acid is dangerous. Batteries generate explosive
gases during normal battery operation. To reduce risk of battery explosion, follow all safety information
instructions and those published by the battery manufacturer and manufacturer of any equipment
intended to be used in the vicinity of battery. Review wcautionary markings on these products and
on engine.
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NOCO Genius BOOST MAX GB251+ Specifications

General

Internal Battery	Lithium-Ion
IP Rating	IP65
Category	Jump Starter
Output Voltage	12V
USB Power Input	5V/2.1A
USB Power Output	5V, 2.1A
Storage Temperature	-20°C to +50°C
Charging Temperature	0°C to +40°C (32°F to +104°F)
Safety Features	Spark-Proof, Reverse Polarity Protection, Over-Current Protection, Over-Charge Protection, Over-Temperature Protection
Included Accessories	User Guide

Summary

Important Safety Warnings

Manual Override Mode Precautions

Details risks and warranty voiding associated with Manual Override Mode.

Internal Battery Charging Safety

Battery Handling and Personal Safety

Eye protection, clean water, avoiding metal objects during battery work.

General Precautions and Operations

Operating and Storage Temperature Limits

Product Compatibility and Battery Types

Compatible only with 12-volt lead-acid batteries.

Battery Charging Procedures and Safety

How To Use

Charging the GB251 Unit

Procedure for fully charging the GB251 using included chargers.

Connecting to the Vehicle Battery

Steps to properly connect clamps to the vehicle's battery terminals.

Jump Starting Procedure

Steps for jump starting a vehicle, including timeouts and rest periods.

Low Voltage Batteries & Manual Override

Using manual override for batteries below 3-volts, with extreme caution.

Powering USB & 12V Devices

Connecting and powering USB and 12V devices from the GB251.

Troubleshooting Guide

Error LED Codes and Solutions

Lists error LED states (red, blinking) and their reasons/solutions.

Flash Codes and Solutions

Explains flash patterns (single, double, etc.) and corresponding fixes.

Hot/Cold LED Status and Actions

Boost Light Not Activating

Troubleshooting for when the boost light does not come on.

Limited Warranty Information

One Year Limited Warranty Coverage

Defect coverage for one year, repair/replacement terms.

Warranty Claim Procedure

Warranty Exclusions