My battery doesn't seem to charge, despite having input.

Also the side connector does not work as intended. It only accepts input from the side which does not have the input texture.
See screenshots below.

I'm using Fabric and mechanicaltech-0.3.0+1.16.

Battery

Battery Back

Battery Front

Battery Left

Battery Right

Windsail:

Windsail Top

Windsail Back

Windsail Down

Windsail Down Right

Windsail Input to Battery Input Block Left

Windsail Right

Side Connector Bug