Charging - place on cradle...and have to play (5-20 minutes) to maybe

Hi - to continue with the title...to maybe charge!

I'm not sure if the charge contacts are sweat/hydraulic oil damaged. I have 3 chargers...all 3 have challenges. Looking at the wrist contact side of the watch there appears to be "a lower contact". So, 1 contact is flush with the watch back and 1 is about .5mm lower (recessed). Any ideas to repair would be great. Once I eventually get the charger connected. No problem to charge.

Any assistance appreciated. Thank you.

Martin