With the Duracell Rechargeable Li-ION Instant USB Charger you can recharge your cellular device's battery on the go anywhere. What's more, you can even use the Duracell Instant Charger like a battery backup, giving you hours of extra run and talk time! Not only is this rechargeable battery backup and charger efficient, it's also quick and easy to use. When your Duracell Instant Charge needs a recharge, simply plug the provided mini USB cable into your laptop, computer, or USB charger. It's that simple.