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Monoprice [monoprice.com] has Monoprice Compact 20,000 mAh Power Bank with PD 20W and QC 3.0 Fast Charging $19.99 + Shipping is Free

Key Features:One of the most compact 20,000 mAh, yet packs enough power for 4‑6 full charges
3 output ports for charging 3 devices at once
Supports QC3.0 (max 22.5W) & PD3.0 (max 20W) fast charging technologies
Details:[LIST][*]Digital LED battery level indicator[*]Compatibility with all mobile devices