Maintain a proper charge on all of your devices with this Battery Tender Waterproof 800 Charger. It is designed with supersmart technology that easily charges the battery automatically. The charger is constructed with a waterproof exterior for long-lasting durability. This battery tender charger protects against damaging reverse polarity and prevents sparks. Easily charge a wide variety of devices with this lightweight and portable charger. It conveniently includes a built-in indicator to show when a battery is fully charged.