thanks for answer, yes I was putting as 145mAh/g.

but in few papers, they mention as 270 as th. capacity.

I think what you calculated is the theoretical capacity when all the Li is utilized (Li(1)MO-----Li(0)MO+(1)Li+e). But the one at the company website is the practical achievable capacity (Li(1)MO ---- Li(1-x)MO+(x)Li+xe, x

Thanks for your answer Appiah Williams Agyei

Yes if I calculated by the formula, then it comes around 279mAh/g, but that company value is practical, if we are going to calculate battery capacity through its C-rate, then we have to put theoritical capacity of a active materials, I was worried which value I should put there, 145mAh/g or 279 or 270mAh/g?

Well the problem has solved now, I am not using C-rate to describe my cell performance, I am using now current density only