This charger solves one of the major annoyances of LiPo batteries: all the hassle that goes into actually charging them. Instead of fussing about with menus and buttons, the B3 charger simply plugs into the balance port of the battery.
Then it charges up the battery.
The place where this charger really shines is when charging up accessory packs like FatShark goggle batteries or a LiPo that you installed in your Taranis. These batteries usually don’t have the XT60 connector that your charger expects. With the B3 charger, you don’t have to dig around to find a lost adapter. Just plug it in to the battery’s balance plug and let it sit for a while.
I also love the B3 charger because it lets me top off my accessory packs without taking up an channel on my main charger. So I don’t have to wait for my Fatshark battery to finish charging before I start charging my flight packs.
The tradeoff of this convenience is that the B3 only works with 2S and 3S batteries, and it charges pretty slowly. At 800 mA charge rate, it would take about 2 hours to charge just one typical mini-quad battery.
Buy the B3 charger if you are looking for an inexpensive way to charge 2S and 3S LiPos–especially ones with non-XT60 connectors.