The Godox Ving is a unique speedlight that uses rechargeable Lithium batteries instead of AA batteries. As a result, you get a far greater battery life (650 full power flashes -- claimed to be the equivalent of 12 AA batteries), and you have faster recycling times. It's almost like having an external battery pack, but built-in to the speedlight itself! Check out this demo video by Gadget Infinity:
The Ving currently has three variants: the V850 is a manual flash, while the V860N is for Nikon i-TTL and the V860C is for Canon E-TTL. Godox has its own wireless radio system: the FT-16, which can adjust flashes remotely, and which is compatible with the Ving and several other Godox products, such as the Witstro and their extensive monolight lineup.
The Ving has received positive reviews from Fstoppers (reviewing the rebranded Neewer TT850), Flash Havoc, Lighting Rumors and others.
The good news is the Godox Ving is on sale: buy 1, get the 2nd at 50% off, through eBay seller "zeniko_online_store":
This sale applies only to Zeniko's U.S. eBay stores (they have items listed from their stores in China, which have a lower price per unit but aren't included in the sale). To avail of the discount, just select "2" under quantity. The price will be updated automatically.
Note: I'm not affiliated with Zeniko or eBay, and we receive no commissions on this. I'm just passing along this tip!