Short answer — best high-quality portable chargers by use case (as of Sept 15, 2025):

• Best all‑around (high power + laptop-capable): Anker 737 / PowerCore 24K — 24,000 mAh, up to 140 W PD output, good multi‑port support and a clear digital display. Great if you need to charge laptops + phones. (anker.com)

• Best ultra‑powerful / premium design: Shargeek (Sharge 170) — very high output (up to ~170 W depending on model), 24,000 mAh class capacity, robust fast‑charge support and IP ratings on some models. Excellent for power users and multi‑device setups. (wired.com)

• Best with built‑in AC outlet (for laptops and appliances): OmniCharge Omni 20+ — includes a 100 W AC outlet plus USB‑C PD and wireless pad; very versatile for field work or travel where you sometimes need mains output. (omnicharge.co)

• Best MagSafe / iPhone magnetic options: Baseus Nomos (and Anker MagGo / Nano MagGo 5K) — most modern magnetic banks now support Qi2 / 15 W magnetic charging or offer very good wired speeds with built‑in cables. Pick one if you want convenient attach‑and‑go charging for iPhone 12+ (and newer). (macworld.com)

• Best value / budget: UGREEN (Nexode / 12k–20k) and similar models — deliver strong PD speeds for the price (many options in the 20,000 mAh / 60–100 W range). Good balance of capacity and cost. (tomsguide.com)

• Best compact / pocket‑friendly: Anker Nano / MagGo 5K and other 5,000–10,000 mAh Qi2 magnetic banks — very light, fit a pocket, ideal for daily carry when you don’t need laptop capacity. (macworld.com)

How I chose these (quick criteria)

• Power delivery: look for USB‑C PD (PD 3.0 / PD 3.1) and the wattage you need (phones ≈ 20–30 W, tablets ≈ 30–60 W, laptops ≈ 60–140 W). (anker.com)
• Capacity vs airline rules: convert mAh → Wh or check the Wh rating on the pack (TSA/FAA limits apply; most airlines allow ≤100 Wh without approval; 101–160 Wh may require airline approval; >160 Wh is typically forbidden). If you travel by plane, keep power banks in carry‑on. (faa.gov)
• Ports & features: number/type of ports, pass‑through charging, built‑in cables or MagSafe, AC outlet if needed, display for % / watts. Reviews and lab tests show these features matter in real use. (wired.com)
• Safety & brand reputation: choose models from reputable brands with protections (overheat, short circuit) and good review histories. Recent product recalls and airline rule changes make brand reliability important. (anker.com)

Quick buying guide (one‑line rules)

• Daily pocket use: 5,000–10,000 mAh, Qi2 MagSafe if you use iPhone magnetically. (macworld.com)
• Day trips / multi‑device: 10,000–20,000 mAh, 20–60 W PD. (tomsguide.com)
• Laptops / heavy users: 20,000–30,000 mAh with 60–140 W PD (or a 100 W AC outlet power bank). (anker.com)
• Airline travel: stay ≤100 Wh (most consumer 20,000–27,000 mAh packs are close to that limit depending on voltage). Carry in cabin only; always check your airline’s policy before flying. (faa.gov)

If you want, I can:

• Recommend 3–5 specific models tailored to exactly which devices you carry (phone only, phone + laptop, travel rules), and include current prices and where to buy.