180mAh 1s 50c battery by Giant Power - weight approx 6g
220mAh 1s 50c battery by Giant Power - weight approx 5.5g
220mAh 1s 50c battery by Peak Power - weight approx 5.5g

Funny the larger capacity are lighter!?
(The experienced say only buy from reputable sources!)

Micro 1s FPV power filter weight 0.7g
Allow a larger selection of cameras for micro's?   

2.4G 8CH Micro Frsky Receiver D8 Compatible, with PPM SBUS Output weight 1g

And finally
Eachine TX-03 fpv camera with switchable 20/50/200mW VTX weight 6g
apparently has a 0mW setting too!?