I think you got your formation levels mixed up there Rod. 10th Panzer Regiment (8PD) had three light panzer battalions, each of two light companies and one medium company.
Medium panzer battalions were more of a mid-war thing, for battalions composed entirely of medium (Pz IV) companies.
Iirc the light companies were the standard 22 tank companies (HQ, three platoons of five Pz38 and one platoon of five PzII).
"Mistakes in the initial deployment cannot be rectified" - Helmuth von Moltke