On-the-goPower bankUSB-C PD
Compact 20,000 mAh power bank
High-capacity packs in a pocketable footprint trade some peak wattage for cell count. This listing covers shared output limits, recharge time from a 45 W adapter, and airline guidance where the manufacturer publishes watt-hour equivalents.
Capacity vs. rated watt-hours
Marketing often lists milliamp-hours at 3.7 V while travel rules reference watt-hours. A 20,000 mAh label typically converts to roughly 74 Wh—below common carry-on limits for lithium-ion packs, but always confirm the printed Wh rating on your unit before flying.
Port behavior under load
- Shared budget: When both USB-C ports are active, total output may drop from the single-port maximum. Check the wattage table rather than assuming each port stays at peak.
- Input speed: Recharge time depends on the wall adapter you pair with the bank. A 45 W PD brick typically refills faster than a legacy 18 W adapter.
- Pass-through: Some models allow charging the bank while powering a phone; heat buildup can limit sustained use—verify whether the feature is supported on your revision.