9V batteries are often found in devices that aren’t used very often. If you use a NiCd rechargeable battery you may find it completely discharged by the time you need it. Capacitors on the other ...

To get my homebrewer’s feet wet, I chose perhaps the simplest of ham radio projects: dummy loads. Every ham eventually needs a dummy load, which is basically a circuit that looks like an antenna ...

So, what do you do if your car's battery runs out of juice? Well, you could use a portable jump starter or, worst case, finagle a jump-start from a neighbor, friend, or relative to get some energy ...

If you need a sturdy tool that can trim the lawn edges or tackle overgrown weeds, then a battery trimmer might be the right choice. Cordless grass trimmers offer similar performance to gas string ...

The top honors for battery life among Intel-based Windows laptops in the last several years went to the first generation of the Asus ExpertBook B9450 (30 hours in our video rundown!), but many ...

It's strangely difficult to find out what your iPad's battery health is. Even now iPadOS 18 is on its way, there's no sign of a full battery health setting coming to devices other than the new ...

What is the best solar battery overall? We've evaluated many solar batteries and the Bluetti EP900 Home Battery Backup is CNET's pick for the best solar battery overall, overtaking the Tesla ...

When your computer battery dips below a certain threshold, Windows gives you an error warning and then puts your computer in a low-power consuming state depending on ...

Of all the sophisticated mechanical parts in a modern vehicle—from turbocharged engines to advance safety systems—the 12-volt battery is one of the least complex, but one of the most crucial.

China’s Farasis Energy unveiled a new electric vehicle (EV) battery with exceptional range, climate temperature tolerances, and charge cycle lifespan. The new battery can operate normally ...

A British startup may have found the answer to one of the frustrations of driving an electric car — waiting around for the battery to charge. Nybolt, based in Cambridge, has developed a new ...

The Baghdad Battery is believed to be about 2000 years old (from the Parthian period, roughly 250 BCE to CE 250). The jar was found in Khujut Rabu just outside Baghdad and is composed of a clay jar ...