Tokyo Gadget

Reviews & guides for smartphone gadgets

Power banks Anker Nano Power Bank (MagGo, Plus): Safety-Focused MagSafe Battery
A look at Anker's new MagSafe power bank, the Nano Power Bank (MagGo, Plus), from public specs: 10,000mAh, Qi2/MagSafe 15W, USB-C 30W, about 15mm thin, with a newly developed battery emphasizing safety. Who it's for, explained simply.
Charging basics What a Power Bank's Protection Circuit Does (Safety Explained)
How a power bank's protection circuit (BMS) works, for beginners. Its role guarding against overcharge, over-discharge, overcurrent, short circuit, and heat—and why to choose certified products like PSE—explained from the principle.
Charging basics Why Batteries Degrade: What Makes Them Hold Less Over Time
Why phones and power banks hold less as they age, for beginners. Charge cycles, chemical wear, and the effect of full charge and heat—the mechanism of degradation and how to make a battery last, explained from the principle.
Charging basics How USB-C Works: Why One Cable Does Power, Data, and Video
Why USB-C plugs in either way up and does charging, data, and video over one cable, for beginners. The pin layout, Alt Mode, the link to USB PD, and why cables differ in performance—explained from how it works.
Charging basics Why Wireless Charging Is Slow and Warm: What 15W vs 25W Really Means, and How to Choose
Why is drop-and-charge slower than a cable, and why does the phone get warm? A diagrammed look at electromagnetic induction—coil-to-coil transfer loss, misalignment, rectification—and what it tells you: where the 15W vs 25W difference shows up, what magnets (MagSafe/Qi2) actually fix, and when to use wired instead.
Charging basics How Fast Charging Works: Why It's Quick First, Slow at the End
Why fast charging is fast, and why it slows down after 80%, for beginners. The CC-CV charging process, how voltage and current are raised, and why it's kind to your battery—explained from the principle.
Charging basics How a Lithium-Ion Battery Works: Why It Can Recharge
How the lithium-ion batteries in phones and power banks work, for beginners. Why they recharge over and over, the roles of the cathode, anode, and electrolyte, and why heat and wear happen—explained from the principle.
Charging basics Volts, Amps, Watts: How to Read Charging Numbers (Made Simple)
The difference and relationship between V (volts), A (amps), and W (watts) in charging, for beginners. What W=V×A means, what actually decides charging speed, and how to read the numbers on a product page—explained from how it works.
Charging basics mAh vs Wh Explained: Why You Can't Charge the Full Rated Capacity
The difference between mAh and Wh on a power bank, for beginners. Why 10,000mAh won't charge your phone by the full rated amount (voltage, conversion loss), and what Wh means for air travel—explained from how it works.
Portable power stations Portable Power Station Wattage Guide: Output (W) vs Capacity (Wh)
Confused by the 'W' on portable power stations? Rated output (W) decides which appliances you can run; capacity (Wh) decides how long. This guide covers the wattage each appliance needs and how to pick the right one, for beginners.
Chargers How to Charge a Laptop with USB-C: Wattage and What to Pick
Want to charge your laptop over USB-C? This guide explains the conditions (USB PD), how to read the wattage you need (65W/100W), and the E-Marker cables required above 100W—how to pick the charger and cable, for beginners.
Power banks Travel Charging Packing: Pack Light, Forget Nothing (Checklist)
Avoid forgotten chargers and bulky cables when you travel. This guide covers a smart charging packing strategy—one multi-port charger, a carry-on-legal power bank, durable cables—plus tips on how to pack it all compactly.
Phone charging iPhone Battery Tips: Settings and Habits to Make It Last
Want your iPhone battery to last longer? This guide covers the settings—Optimized Battery Charging, an 80% limit, checking Battery Health—and the habits that slow wear, like avoiding 0%/100% and heat, in beginner-friendly terms.
Wireless chargers Why Wireless Charging Is Slow or Hot — Causes and Fixes
Wireless charging feels slow, or your phone gets hot? This guide covers the common causes—misalignment, thick cases, low charger output—with a fix for each, plus tips to charge comfortably with Qi2/MagSafe, for beginners.
Chargers USB PD, PPS, QC Explained: Charging Standards and How to Tell Them Apart
USB PD, PPS, QC—too many fast-charging standards to keep straight? This guide explains the main charging standards, why charging won't go fast unless they match, and how to tell what's supported, in beginner-friendly terms.
Power banks Power Backup Checklist for Outages and Disasters (Phone & Home)
What will you do to charge your phone if the power goes out? This guide organizes your emergency power prep into a staged checklist—one person, family, and stay-at-home evacuation—covering when to use a power bank vs a portable power station, and how to store them.
Power banks How to Use a Power Bank: The Complete Beginner's Guide
A complete guide for anyone who just bought a power bank and isn't sure how to use it. Covers charging the unit, reading the ports (input/output), thinking about capacity (mAh), using it safely, and care, storage, and lifespan—explained for beginners.
Power banks Portable Power Station vs Power Bank: Which Should You Choose?
What's the difference between a portable power station and a power bank? This guide sorts out capacity, AC (outlet) output, and size in a clear comparison table, and explains which to choose by use—phone-focused vs disaster prep, outages, and the outdoors.
Wireless chargers Best 3-in-1 Wireless Chargers [iPhone, Watch & AirPods in One]
A 3-in-1 wireless charging station charges your iPhone, Apple Watch, and AirPods together. This guide explains how to choose one (Qi2/MagSafe magnetic alignment, Apple Watch support, stand vs folding) and recommends picks by type.
Chargers Choosing a Charger for the Switch 2 [20V, 54W+ — Best GaN Chargers]
The Nintendo Switch 2 draws relatively high power in dock (TV) mode. This guide explains how to choose a charger for the Switch 2 (20V output, 54W+, USB PD), how handheld vs docked differ, and recommends easy-to-use GaN chargers.