Try starting the vehicle. Most vehicles will immediately start. Some vehicles may require the GB50 to be connected for up to 30 seconds before starting. If the vehicle does not start right away, wait 20-30 seconds and try again. Do not attempt more than five (5) consecutive jump starts within a fifteen (15) minute period. Allow the GB50 to rest for fifteen (15) minutes before attempting to jump start the vehicle again. As is the law, please note that that as we got the product for free, this post should be deemed an #ad.

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. 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. Cold LED Illuminates solid Blue; unit is fully operational, but approaching lower temperature limit. The GB50 comes partially charged out of the box and needs to be fully charged prior to use. Connect the GB50 using the included USB Charge Cable to the USB IN port and the USB car charger. It can also be recharged from any USB powered port, like an AC adapter, car charger, laptop and more. The USB IN port is rated at 2.1 Amps to ensure safe and efficient charging of the internal lithium battery. Due to FCC regulations, we recommend not to charge and discharge the unit at the same time. The time to recharge a GB50 will differ based on the discharge level and the power source used. Actual results may vary due to battery conditions. Charger Rating: .5A 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.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.

Disables safety protection and manually forces Boost "On". Only for use when a battery is too low to be detected. 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. 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.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). Unit is too cold to jump start, but other functions are still available. / Allow the unit to warm up. 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. Unit is too hot to jump start or use other functions. / Allow the unit to cool, and bring the unit into cooler environment. 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.