Compact, yet powerful lithium jump starter rated at 1,000 Amps - up to 20 jump starts on a single charge.

A: After all necessary connections are completed and the vehicle’s power loads are switched off, press the Power Button of GB40 to begin the jump-starting process. All LEDs will flash, indicating properly functioning LEDs. The White Boost LED will illuminate indicating a proper connection to the battery. Reverse connection of battery clamps makes the Red Error LED to illuminate. Reversing the connections again will flash the White Boost LED which means the GB40 is ready for jump-starting the vehicle.Connect the GB40 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. Charging Times While the GB40 and GB50 are very similar in specification, NOCO Boost HD GB70 builds on their features with one handy add-on. We’ve touched upon the fact that the GB70 comes with a 12-volt/15A power out port for powering any 12-volt devices like tire inflators, inverters , and more. It offers a 12-volt/3A/36-Watt power input port that allows for rapid charging in 3 hours via your vehicle’s 12-volt port. This greatly increases the GB70’s versatility and usability. Downside is the short lead length which is not a problem if your battery connections are on top, you would struggle if the battery was sideways. If the Company made the leads a little longer I would give a 5 star rating. Its a little unfair for me to take a star away because for me this was not a problem but if your connections are not easy to get to then this is not the product for you. The NOCO Genius Boost+ GB40 is a compact and portable solution for jump starting a vehicle's battery on-the-go. The charger's small size allows it to be easily stored in a glove compartment or trunk for emergency situations. The single USB port allows for simple charging of mobile devices, making it a versatile accessory to have on hand. Disables safety protection and manually forces Boost "On". Only for use when a battery is too low to be detected.

The 25% Charge LED will slowly pulse "On" and "Off", when the battery is less than 25% charged. When the battery is 25% charged, the Red Charge LED will be solid. This is great for those emergency situations in which a jumpstart doesn’t get your car started because of an underlying issue. When you have the Noco Boost in your car you’ll never have to worry about your phone dying. The GB40 has four (4) Charge LEDs - 25%, 50%, 75% and 100%. These Charge LEDs indicate the internal battery's state-of-charge (SOC). See below: LED The absence of a built-in display is compensated for by the charger's construction with high-quality materials, ensuring its reliability and durability over time. The RoHS certification indicates that the charger adheres to European Union regulations and is environmentally sustainable. Once the GB40 is properly connected to a power source, the red charging indicator light will turn off when the GB40 is fully charged. Restricted to 12-volt lead-acid batteries

Powerful Battery Jump Starter

Compact, Advanced and lightweight design for carrying and using ease without having to worry about being helplessly stranded in emergencies. Illuminates Red if reverse polarity is detected, or blinks "On" and "Off" when the internal battery temperature is too high. The GB40 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 GB40 can not detect a battery.