This is probably the most capable charger on the market for the Whoop crowd. The UP-S4AC has 4 ports allowing you to charge both 1S and 2S LiPo/LiHV batteries. Its small size makes it easy to carry everywhere and you can power it with a built-in AC power supply (AC cable included) or DC input from a larger battery (XT60 2S-4S) for the ultimate carry-around charger.
That's right - you can use this to charge your 2S whoop batteries! It charges through the balance lead so no worries about what type of main connector your battery has.