How do I charge the Everstart JUS750CE for the first time?
Fully charge the unit using a household extension cord connected to the built-in 120 Volt AC charger for a full 24 hours, or until the Battery Status Icon shows 4 solid bars. The unit is delivered in a partially charged state and must be fully charged before first use. You cannot overcharge the unit using the AC charging method.
From the official Everstart Jus750ce manual, page 4
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