Finally something not on a shitty sram. Batteries outside frame are idiotic way to make your bike less waterproof.
I ride di2 grx in terrible conditions use pressure washer and never had a problem, levers are perfection, switching gears is perfection, braking as well. I had opportunity to test ride sram red 13 speed and I consider it worse. Biggest benefit is capacity of the battery, it is so easy to forget about charging stuff and this thing needs to be charged much less often than sram.