Batteries

Tech 13 Sep 2026 5 min read

Power Bank Capacity: mAh and Wh Describe Different Things

A power bank marked 10,000 mAh does not normally deliver 10,000 mAh into a phone battery. The label describes charge stored by the cells under a particular voltage basis, while the USB output operates through conversion electronics and the receiving device has its own charging losses. That distinction makes power bank capacity easier to interpret. Milliamp-hours are useful, but they are incomplete without voltage. Watt-hours describe stored energy more directly and make comparisons across different voltages less confusing.

Power Banks Batteries

Tech 11 Sep 2026 9 min read

Pass-Through Charging in Power Banks: What It Actually Does

A power bank normally has two separate jobs: it charges its own battery from a power source, and later it uses that stored energy to charge another device. Pass-through charging combines those jobs by allowing the power bank to receive power while it is also supplying power to a connected device. That sounds simple, but it doesn’t mean every power bank behaves like an extension lead for USB power. The power bank still has to manage incoming power, its own battery, and the output sent to the other device. Product design and supported charging protocols determine what happens.

Power Banks Charging

Tech 05 Sep 2026 8 min read

Why Your Laptop’s Battery Time Remaining Keeps Changing

A laptop may say it has four hours of battery time remaining, then show two and a half hours after you start a video call. Close the call, lower the screen brightness, and the estimate may climb again. The battery did not suddenly lose and regain a large amount of energy. The changing number makes more sense once you treat it as a forecast, not a countdown. Your laptop knows roughly how much usable charge remains, but it cannot know exactly what you will ask the computer to do for the rest of the day. It estimates runtime from the battery state and the power the system is using or expects to use.

Batteries Laptops

Tech 05 Sep 2026 8 min read

Why Phone Charging Slows Down Near Full

A phone that gains a large amount of charge quickly can seem to slow dramatically as the battery approaches full. That can be confusing when the same charger and cable are still connected. If a charger is advertised for fast charging, why does the final part take so long? The short answer is that charging speed is not meant to stay constant from empty to full. A phone controls how much power its battery receives, and the safe, appropriate rate changes as the battery’s state of charge, voltage, and temperature change.

Battery Charging Smartphones