My battery does indeed last 3 weeks. The G3 hub has a more powerful transmitter to send the signal through the hub shell hence less life. I get a battery low warning after the first week, it dies after 3 weeks. Otherwise the hub funcions perfectly. I do wonder how long it takes to switch off after use however if i stop on a ride the zero data seems to stop after about 10 minutes so i guess it is switching off.

anyone else with a G3 that can confirm their battery life? I get about 40-50 hours ish