Freemax Maxus 200W and Maxus 100W apply patented SmartLoad Tech for loading the batteries. There is no need to distinguish positive and negative poles, you can assemble the batteries at your own will, super easy and convenient. The Maxus 200W mod also supports a single battery load with SmartLoad Tech, making it a more customized mod, while Maxus 100W Mod is compatible with 21700/20700/18650 batteries.
