The new 4S High-Voltage battery charger is specially designed for SplashDrone 3+ new High-Voltage battery (4S-LiHV) and the 2S remote battery. 

It is has fast charging ability, and easy to use. Just plug and charge.  

(Note: It doesn't support the normal SplashDrone 3 battery, pls don't use this charger to charge the normal 5200mAh battery, it might damage the battery)