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Today only, B&H Photo Video offers the HP Power Pack Plus 18,000mAh Portable Battery Pack Bag for $39.99 with free shipping. That's the lowest price we could find by $64, although it was $5 less in December. It charges up to three devices simultaneously via two USB Type-A ports and one USB Type-C port. It also includes a 7.4mm-to-4.5mm tip adapter and cable for charging HP laptops. (Laptop charging requires the bag be plugged in via the included power adapter.)