To check your iPad's battery health, you'll need to install a third-party app, which will require you to connect the iPad to a computer.

You can check the health of your iPhone's battery to determine when it's time for a replacement.

Open one of your iPad’s analytics files (these files start with “Analytics” followed by a date). In the analytics file, tap ...

Is it OK to check your phone’s power bank Can you charge your tablet in the overhead bin? What about a cordless hair dryer?

Confused by kilowatts? Can’t tell an anode from a cathode? Here is a simple guide to the jargon likely to be tossed around at Tesla’s Battery Day on Sept. 22.

From budget picks to pro favorites, multimeter brands earn mixed reviews. Here's how some of the most popular choices stack ...