This dumb little battery trick tells you if it's really dead

When you purchase through links in our articles, we may earn a small commission. This dumb little battery trick tells you if it's really dead You can find out how full or empty a battery is with a simple test. When your remote control gives up the ghost or your kid's favorite toy stops working, you're often faced with the question: Did the batteries die or is the device defective? A dead-simple, wonderfully nifty test offers a quick and reliable way to check the actual charge state of a battery, keeping you from rashly discarding good batteries or buying new ones unnecessarily. How to check your laptop's battery health All you need for this test is the battery you want to check.