Kaala Bala means the Time Strength. its a subtopic in Shad bala in Vedic Astrology. More specifically we can say that the planets receive Time Strength which is permanent from various sources. Time Strength is sub-divided in to six parts namely, Nataunnata Bala (diurnal strength), Paksha Bala (Moon phase strength), Tribhaga Bala (day night strength), Varsha, Maas, Dina Bala (Year, month, day strength), Yuddha Bala (planetary war strength) and Ayan Bala (equinoctial strength). in this video to the extent i have tired to explained.