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A sample of more than one million Ke4 decay candidates with less than onepercent background contamination has been collected by the NA48/2 experiment atthe CERN SPS in 2003-2004, allowing a detailed study of the decay properties.The branching ratio, inclusive of radiative Ke4gamma decays, is measured to beBR(Ke4) = (4.257 +/- 0.016_exp +/- 0.031_ext) x 10-5 with a total relativeerror of 0.8%. This measurement complements the study of S- and P-wave hadronicform factors by assigning absolute values to the relative hadronic form factorsobtained earlier in a simultaneous analysis of the pion-pion scattering lengthsconducted on the same data sample. The overall form factor normalization f_s =5.705 +/- 0.017_exp +/- 0.031_ext is obtained with a total relative precisionof 0.6%.

New measurement of the charged kaon semileptonic (Ke4) decay Branching Ratio and Hadronic Form Factors