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Hi bigboi, Great question! The Energizer Ultimate Lithium 50,000mAh Power Bank charges using a USB-C wall adapter. To ensure fast and efficient charging, we recommend using a Power Delivery (PD)–compatible USB-C adapter with at least 30W output. USB-A adapters won’t work for charging this power bank, as its input is USB-C only. --Energizer PowerPacks Service Team
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