Methodology: how we interpret charging specification language
CompareAnchor translates manufacturer wattage tables and protocol names into checks you can verify before purchase. We do not rank products or imply universal compatibility.
Editorial independence
CompareAnchor is a standalone informational resource. We do not rank products for purchase, we do not host checkout, and we do not use price-check or “buy now” prompts. Coverage is selected for spec clarity and setup practicality—not for conversion.
Total wattage vs. per-port limits
Packaging often highlights the largest single number on the box—100 W, 65 W, or 45 W—without clarifying that multi-port devices share a budget. Our listings cite combination charts where available: which port drops when another device connects, and whether both ports can sustain peak output simultaneously.
USB Power Delivery and PPS
USB PD negotiates voltage and current between source and sink. Fixed profiles (such as 20 V at 3.25 A for 65 W) cover many laptops; Programmable Power Supply (PPS) adds fine-grained steps useful for some phones and small appliances. Absence of PPS does not prevent charging, but may cap peak phone speeds compared with OEM adapters.
Capacity labels on power banks
Milliamp-hour ratings are typically measured at 3.7 V cell voltage. Travel regulations reference watt-hours. When airlines or transit agencies publish limits, we note the manufacturer’s Wh conversion if printed on the product or manual—not derived estimates unless clearly labeled as such.
Cables and e-markers
High-watt USB-C cables may include an e-marker chip that advertises safe current to the charger. Underrated cables can force a lower PD profile even when the brick supports more. We mention cable requirements when manufacturers specify them; we do not claim one cable works for every device class.
What we omit
We avoid superlatives, outcome guarantees, and “works with everything” language. Retailer availability and price change frequently; analyses focus on spec behavior. For corrections, use Contact.