Strict industrial competition in particular Battery manufacturing is always competing to improve the quality of a product and reduce as much as possible reject claim market. So this research will focus on this key action improvement by using DMAIC approach method which has been known as the most effective problem solving method and has been widely used by many previous research. The research design used is explorative quantitative type focusing on 4M analysis to find the cause of the problem and find the solution. Starting with step 1: Define, through the collection of data sampling month of Jan-Dec 2016 known that reject claim of Plate bent is 41 PPM Step 2: Measure, Processing data reject and the amount of claim reject and set the target that will do the improvement 3: Analyze , benchmarking against type cassette A and Cassette B from FTA analysis Step 4: Improve, define and standardize Cassette Type cassette B dimensional changes by changing the partition edge L and edge R from C3mm to R4mm from Cp = 1.58, Cpk = 0.63 to Cp 2.32 and Cpk 2.23. Step 5: Control, After getting the dimension set value 29.5 PPM down to 4 PPM with target standard 18 PPM and decrease to company cost savings of 455.5 KUSD / Year.

Keywords : Battery Manufacturing, Plate bent, Six sigma, Benchmarking, FTA, Cost Saving,Reject.