FYI: you can currently get a 30000mAh 65w Baseus power bank for £35 on : r/SteamDeck

PD 100W power bank can fully charge your 15 MacBook Pro 2018 in 1. 5 hours from 0% to 100% and can be fully recharged within 2 hours using a 100W wall charger and the 5A / 100W USB-C cable (only 100W cable is included).

iMuto 100W Laptop Power Bank, 20000mAh External Battery for Laptop, PD Fast Charging USB C Power Bank, Compatible with Laptop, MacBook, Surface

Baseus Power Bank 65W 20000mAh 40% Off – Steam Deck Life

Baseus 100W Power Bank 20000mAh Type C PD Fast Charging Powerbank Portable External Battery USB Quick Charge For Macbook Laptop

Baseus 65w 30,000mAh Power Bank (feat. Steam Deck w/Asus Ally)

A Comprehensive Guide to the Best Steam Deck Power Bank

Baseus Portable Charger, 30,000mAh Power Bank 65W Battery Pack, Smart Digital Display, 7-Port for Laptop, MacBook, iPad, iPhone 15/14/13 Series, Steam Deck, ROG Ally, Samsung (Black) : Cell Phones & Accessories

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BASEUS 65 Watt Power Bank - The Best Portable Charging for Steam Deck?

【65W PD Fast Charge】Recommended by the well-known media Polygon as a portable battery for ASUS ROG ALLY. 65W USB-C port provides enough power to

Baseus Portable Charger, 30,000mAh Power Bank 65W Battery Pack, Smart Digital Display, 7-Port for Laptop, MacBook, iPad, iPhone 15/14/13 Series, Steam

FYI: you can currently get a 30000mAh 65w Baseus power bank for £35 on : r/SteamDeck

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BASEUS 65 Watt Power Bank - The Best Portable Charging for Steam Deck?

Baseus 65W Power Bank 30000mAh PD Quick Charging Powerbank Portable External fast Charger For phone Tablet For Xiaomi - AliExpress

For anyone who is looking for a smaller power bank, Baseus 30W 10000mah works fine and fits on case bottom compartment : r/SteamDeck