1.There are two kinds of battery spring, one is battery chip spring and the other one is battery spring;
2.Battery chip (7#,5#,3#,2#,1# ,existing models to choose from),
3.Materials optional: Steel,copper, stainless steel;
4.Mold cycle: 5-7 , fee 500
5.Battery spring no need molds and no need fee;
6.Easy to solder tin, hard to rust. 24H salt sprays test.