I brought my Dyson vacuum back to life with this $22 attachment

My Dyson V8 worked great for about three years. Then the battery started dying faster and faster. I used to clean my whole 2,200-square-foot house without recharging, but now I can barely get through one floor before it quits on me. The worst part wasn’t just the dying battery—waiting three hours (or more) for it to charge back up was the real killer. You can’t plug it in and keep vacuuming like some other cordless devices.