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Warm Tip: 5 pairs of welding needles = 10 starts, 20 pairs = 40 or more postage 1. products Application scope: spot welding between nickel strip, nickel infiltrated steel sheet, coated steel strip and other materials in battery production. In the production of nickel-hydrogen batteries, nickel-cadmium batteries, polymer batteries, lithium batteries and other batteries, spot welding connecting pieces, batteries, lead-out pieces.