
Wagan's 4A Intelligent Battery Charger is perfect for maintaining your battery especially when it will not be used for an extended time. Such applications include: ATVs, Snowmobiles, Motorcycles, Watercraft (boats, jetski, etc.), Trailers, RVs, Ride-on Lawnmowers, Tractors, Classic Cars, Auxiliary Batteries, Back-up power supply, Solar Battery, and more! Whether you're using this on your daily driver or on a stored vehicle, you don't have to worry about over-charging or damaging your battery. Our charger automatically detects the battery and its needs - then applies the optimal charge current.
A: Hello Yellow, The 4 Amp Battery charger does not have a battery inside and cannot be "recharged". It is good to go and fully ready to use out of the box! Simply plug the device in and plug it into your 12volt battery to get started. USB is not possible as this device is not designed for USB, it is for charging a 12 Volt battery.
A: Hello Deadbug, The 4 Amp Battery Charger automatically detects the battery and its needs - then applies the optimal charge current using a 9 stage charging cycle. This process undergoes Primary Evaluation (Diagnostic), Recovery, Soft Start, Pulse, Reconditioning, Bulk Charge, Absorption Charge, Evaluation (Diagnostic), and Maintenance Charge. However, if the battery is too far gone and unable to hold a charge, no device will be able to recover it or recharge it.