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Hi Fritz, Your Garmin GPS requires a 12V input, while the Energizer Ultimate Lithium power bank provides 5V via USB ports (even with Power Delivery, it only adjusts up to 9V or 12V for certain USB-C devices, not for 12V DC barrel connectors). This is why it won’t charge your GPS directly. You would need a step-up adapter or a dedicated 12V car charger for compatibility. --Energizer PowerPacks Service Team
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