Nothing magic, it's science. In the lead acid battery world, since from a long decade no major changes had been seen and to backing up for power outage to our valuable households, we now a days have solutions like inverters & UPS. But behind all the power providing solutions batteries play major role and cost of battery is approx. 75% of total investment hence forth.
So the question arise here is while we are paying this much of amount for batteries, did we get the total benefit out of it ? And the answer is NO.