Pin too short...
1) Too short - Pin not touching The
rda
2) Too Short - Pin not touching the Battery
1) choose either one
a) If pin not touching RDA/
tank - File the insulator thinner. Usa sandpaper No1000 or 800.
b) If pin not touching RDA/
tank - Use a flat head screw driver and unscrew the RDA's 510 connection
C) If still can touching - use both
2) If Pin not touching battery (rattling sound) - turn the copper pin looser