5000mAh vs 10000mAh vs 20000mAh — Which Power Bank Capacity Actually Suits You in 2026?

No, 5,000mAh capacity gives ≈ 3,100mAh actual, while S26 Ultra battery is 5,000mAh. The power bank charges it from 0 to 62% only — not a full charge. Best for S26 Ultra: 10,000mAh minimum (1 charge + 30%), optimal: 20,000mAh for full daily use or travel.

Advertised capacity (like 10,000mAh) is measured on the internal battery voltage 3.7V. The phone charges at 5V — meaning the conversion loses energy. Actual capacity for an authentic power bank = advertised × 0.62 (approximately). 10,000mAh advertised = 6,200mAh actual = 1.3 full charges for iPhone 17 Pro Max. For counterfeits: only 60% of that.

Because an authentic 30,000mAh lithium cell costs 70-90 USD (3,500-4,500 EGP) — just the cell. That excludes the chip, casing, and profit. A 600 EGP "30,000mAh" power bank contains used cells from broken laptop batteries, or the number is completely fake. Actual capacity: 6,000-8,000mAh max.

No, an authentic 10,000mAh lasts 4-5 years (≈ 800 cycles before capacity drops to 80%). The price gap between 10,000mAh (1,270 EGP Anker ZOLO) and 20,000mAh (1,730 EGP) = only 460 EGP. If you need two daily charges, take 20,000mAh from the start. If one charge, 10,000mAh is more economical and doesn't need replacement.