Lead Acid Battery Case Injection Mold Tooling Service S136 High Polish Custom Molding

This service covers the complete design and manufacture of injection molds for lead acid battery cases and covers, plus serial molding of the finished parts. Battery containers demand exceptional dimensional stability, chemical resistance to sulfuric acid electrolyte and impact toughness for rough handling. Our S136 high polish tooling combined with PP copolymer material delivers exactly those properties.

Depending on your program, we supply mold-only with trial samples and drawings, or full turnkey production including cover, case, terminal inserts and heat sealing readiness.

• S136 high polish cavities: smooth surfaces release parts cleanly and resist acid corrosion over long runs.
• Thin-wall PP design: 2.5-4.0 mm walls reduce weight and material cost while keeping burst strength high.
• KLM standard mold base: reliable, interchangeable components shorten maintenance and repair time.
• Single or double cavity: cavity count is matched to annual volume for the best cost per part.
• Acid-resistant material guidance: we recommend PP copolymer grades with proven electrolyte compatibility.
• Heat seal flange precision: cover flange tolerances support strong lid-to-case heat welding.

Battery cases and covers molded by this tooling serve standby power systems, UPS units, electric forklifts, golf carts, solar energy storage cabinets, emergency lighting and automotive auxiliary batteries. The same mold technology also applies to acid-resistant containers, electrolyte tanks and industrial battery box assemblies.

Xiamen KDT Technology Co., Ltd. has designed and built injection molds since 2007, with an integrated tooling room equipped with CNC machining centers, EDM and a dedicated polishing shop. Our 40 to 50 engineers and technicians support battery, automotive and industrial clients worldwide, with 80% to 90% of output exported to Europe, the Americas and Asia.

We begin every battery case program with a DFM review that covers draft angles, wall thickness balance, gate location and ejection strategy. Mold flow analysis verifies filling of thin-wall sections and predicts weld lines in critical areas. After steel cutting, first trials are followed by OTS inspection and golden sample approval before pilot production, and we provide documentation packages for your internal qualification.

An Australian UPS manufacturer ordered a double cavity S136 mold for a 12V 7Ah battery case. Our thin-wall design cut part weight by 12% and the mold has produced over 400,000 cases with consistent heat-seal quality. A solar storage integrator in the United States also uses our tooling for a 100Ah battery box, with a 35-day mold delivery that met their product launch deadline.

Molds are rust-proofed, wrapped in VCI film and packed in wooden cases for sea or air freight. Production parts are inspected against the approved golden sample, with dimensional reports and material certificates included. We follow AQL 2.5 final inspection and keep complete records for your traceability. Contact our team with your battery case drawings for a tooling quotation.