PiZ-UpTime 2.0 UPS for Raspberry Pi2, Pi3, PiA, Pi-Zero, SBC & other IoT

I have my battery going into the green block, and i am powering my raspi using the 5v. my batteries are getting drained beyond repair. can i prevent?

Can input power be supplied to solder pads on the board instead of the micro usb b in?

If i utilize the iuniker usb dongle expansion breakout will i be able to restore power/ charge the battery via the pi gpio connections?

How to setup i2c address in Rasbian Buster? The address not show up with i2cdetect -y 1 or 0!