KOSPET TANK S2 Magnetic Charging Base

I've had problems with two Kospet S2 charger bases. The little brasses electrical contacts always lose their springy power and no longer contact the watch which means the watch never charges over night.

Love my KOSPET TANK S2 watch, We had gone out of town for awhile, upon returning I thought I had unpacked my charging base. BUT, when it was time to charge my watch I could not locate the charger. I did order 2 chargers so I will always have a charger available.