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As one of its daily deals, A4C offers the used Tumi Moto Mod Portable Battery Power Pack/Phone Case in Black for $24.95 with free shipping. That is $22 less than the lowest price we could find for a new unit elsewhere. It provides up to 22 hours extra battery, and is compatible with Moto Z Droid and Moto Z Force Droid. Deal ends today.

Note: No warranty information is provided, but it's covered by A4C's 30-day "just because" return policy.