What on Earth does that mean, recommended usage? Top subscription boxes right to your door, 1996-2023, Amazon.com, Inc. or its affiliates. GOOLOO GP2000 2000 Amp Car Battery Jump Starter Power Bank, type - eBay Why is your battery jump starter not charging? If a steady red light comes on and the unit is beeping, the connection needs to be reversed. Battery Indicator :Press the power switch to check the battery power: The indicator will blink one by one during the period of charging. you can disconnect the jumper cable plug from the jumper starter, the Over-start Protection will be removed.Q4: How do you know if this unit is connected to the vehicle correctly?A: With the battery clamps connected to the vehicle battery, when the indicator on the jumper cable shines a steady green light, it means its connected correctly. The first thing you should do if your Gooloo jump starter is not charging is to check the battery level. Easy to use Portable Charger Quick Charge 3.0 Technology: Ensures the fastest charging efficiency, 75% faster charging speed than conventional charger. We will provide the after-sale service for you within 24 hours. Read this instruction manual carefully before using this unit. If it still does not work, contact us at: contact@gooloo.com ( Attach your order ID).Q7: What should I do if this unit cant charge other devices?A: Try to use another charging cable to charge it again. Its finally happened. Please note that returns sent by post must be paid by the sender (unless a product quality issue occurred). GOOLOO GP2000 Jump Starter 2000A Peak Car Starter for Up to 9L Gas or 7L Diesel Engine SuperSafe 12V Jump Box Auto Lithium Battery Booster Portable Power Pack with USB Quick Charge, Type-C Port. http://www.gooloo.com/account.php?module=createSign-up to be our member and get an extra 6 months warranty. When the vehicle has been started, remove the jumper cable from the jump starter and vehicle battery. GOOLOO GP4000 Jump Starter. A built-in LED light with 3 modes can be worked as a practical flashlight to check your car or send an SOS signal if needed.