Xiaomi Power Bank 4i 20000mAh Review: What You Actually Get Out of It
20,000mAh, 33W, three output ports. Here is the realistic charge count and the two specifications worth checking before you buy.
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Power & Charging
Power banks, chargers and cables — the numbers that decide whether they work for you.
Why a 20,000mAh Power Bank Never Gives You 20,000mAh
The gap between the printed capacity and what reaches your phone is real, predictable, and not a defect. Here is where it goes and how to estimate what you will actually get.
Power Bank Safety: What to Look For and What to Avoid
A power bank is a large lithium cell you carry in a bag. Most are entirely safe; the ones that are not share a small number of recognisable traits.
Portronics 80W Dual Output Car Charger Review: Read the Split, Not the Total
80W across two ports is not 80W to your phone. Here is how the number divides and what it means for charging in a car.
GaN Chargers: What Changed and Whether It Matters to You
Gallium nitride made chargers smaller and cooler rather than faster. That is a real benefit, but only for some of the things people buy them for.
Fast Charging Standards: PD, QC and the Proprietary Ones
A 65W charger can charge your phone slowly if the two do not speak the same protocol. Here is which standards matter and how to check compatibility before buying.
Choosing a USB-C Cable That Will Not Throttle Your Charging
Identical-looking USB-C cables differ by a factor of forty in power and a factor of hundreds in data speed. Nothing on the outside tells you which one you have.