... source. 2.Battery connector thick:0.1mm-5mm. 3.Nickel plate is best. 4.ISO9001. 5.OEM. Battery connector is an ... ,iron,stainless steel material etc.Usually it's plated with silver and nickel.It's good for conducting electrical source. Battery ... ,No.3,No.5,No.7.4.Surface treatment:CT plate,Silver Plate,Nickel Plate.5.Applicantions:Lightings,Battery,Telephone,Plush toys,Electronic toys.