What should I do if my EverStart Jump Starter won't charge?
If your EverStart JUS750CE will not charge, ensure that all charging connections are secure and the AC charger is properly connected to a working power outlet. Refer to the manual for detailed troubleshooting steps or contact customer service at 1-877-571-2391 for further assistance.
From the official Everstart Jump Starter manual, page 24
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