Press the Power Button to begin jump starting. All LEDs will flash, indicating that all LEDs are properly functioning. If you are properly connected to the battery, the White Boost LED will illuminate. If the battery clamps are connected in reverse, the Red Error LED will illuminate. Reverse the connections to clear this error and then the White Boost LED will illuminate. The White Boost LED is illuminated, when the GB50 is ready to jump start your vehicle. Cold LED Illuminates solid Blue; unit is fully operational, but approaching lower temperature limit.

When recharging, the charge level of the internal battery is indicated by the Charge LEDs. The LEDs will slowly pulse 'On' and 'Off' and become solid until all four Charge LEDs are on. When the battery is fully charged, the Green 100% LED will be solid, and the 25%, 50% and 75% Charge LEDs will turn "Off". From time to time, the Green 100% LED will pulse indicating maintenance charging is occuring. When disconnecting, disconnect in the reverse sequence, removing the negative first (or positive first for positive ground systems). Disables safety protection and manually forces Boost "On". Only for use when a battery is too low to be detected. Boost LED Illuminates White when Boost is active. If the unit is connected properly to a battery, the GB50 will automatically detect a battery and go into Boost mode (LED flashes White when Manual Overide feature is active).The GB50 is designed to jump start 12-volt lead-acid batteries down to 2-volts. If your battery is below 2-volts, the Boost LED will be "Off". This is an indication that the GB50 can not detect a battery. If you need to jump start a battery below 2-volts there is a Manual Override feature, which allows you to force "On" the jump start function.

So, what’s our verdict on the NOCO Boost GB50 XL? The GB50 is an ultra-portable, lightweight and compact lithium-ion jump starter for 12-volt batteries — and a portable charger for your gadgets while out on an adventure. You can safely jump start a dead battery in seconds – and up to 30 times on a single charge. That’s pretty powerful. Hot LED Illuminates solid Red; unit is fully operational, but approaching upper temperature limit. Flashing Red; unit is too hot to jump start, but other functions are still available. 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.

GB20 Boost Sport

The NOCO Genius Boost XL GB50 is a battery charger specifically designed for charging dead or low batteries in a variety of vehicles and equipment. It is a portable and compact charger that provides a high level of power for its size. And what about that jump starter? Well, while Alex hasn’t had to jump his cars yet, it did the jib beautifully on his boat on an engine that hadn’t started all winter. We’ll call that a success! So, with the torch built in, and holding a charge for up to a year it’s a handy bit of kit. USE THIS MODE WITH EXTREME CARE. THIS MODE IS FOR 12-VOLT LEAD-ACID BATTERIES ONLY. BOTH THE SPARK PROOF AND REVERSE POLARITY PROTECTION FEATURES ARE DISABLED. PAY VERY CLOSE ATTENTION TO THE POLARITY OF THE BATTERY BEFORE USING THIS MODE. DO NOT ALLOW THE POSITIVE AND NEGATIVE BATTERY CLAMPS TO TOUCH OR CONNECT TO EACH OTHER AS THE PRODUCT WILL GENERATE SPARKS. THIS MODE USES VERY HIGH CURRENT (UP TO 1500 AMPS) THAT CAN CAUSE SPARKS AND HIGH HEAT IF NOT USED PROPERLY. IF YOU ARE UNSURE ABOUT USING THIS MODE, DO NOT ATTEMPT AND SEEK PROFESSIONAL HELP. Unit is too cold to jump start, but other functions are still available. / Allow the unit to warm up. 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.