As far as I know 18S is an older model which is going for around 60k. I got my 1.5 ton 1804S latest model for 70k and was being sold in ISB metro for 75k 2 weeks ago.
Older models have less saving capacity where's newer models1803S 60% and 1804S 75% saving ability.
Sent from my iPhone 6s using PW Forums