Ryobi AP4700 4V Battery Charger W/Fuel Gauge;

You need to keep your tools charged. Keep one of these Tek4 chargers handy for when you don't want to wait around for your flashlight to work. This compact charger can be kept out of sight in almost any AC outlet, charging your Tek4 batteries in as little as 5 hours. Its prongs fold down, so you can keep it tucked in the smallest crannies of your tool kit. On top of that, you can tell how much your batteries have charged with the help of the handy fuel gauge, a feature unprecedented in previous models of the 4 Volt lithium ion chargers. There is also a battery testing feature that lets you see if you need to replace your batteries or not. It also lets you know if you're working in temperatures not suitable for the battery you're using. If you want to have 4V tools in your arsenal, then you need a charger. Go with the Ryobi AP4700 for a quality charger experience.