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Use a lithium battery inbuilt inverter, its one box that takes care of everything.

Lead-acid batteries give of Hydrogen. Highly inflammable/explosive: a closed box is a big no-no.

Lead-acid batteries are also extremely heavy, and inverters are not exactly light weight. Are you sure you want to put these things so high up?

I did voice my concerns to the interior guy about inverter batteries requiring ventilation; he mentioned that this 'box' is what most people are going with now-a-days.
Didn't give it much thought then, asked him to proceed with it.

Do the 'maintenance free' batteries also vent out gas?

I don't know for sure, but I assume they must, as it would be the same chemistry.

Calling expert help from someone please!

Does anyone have an estimate of how long the inbuilt lithium battery in these new-gen lithium battery inverters last?

Are these replaceable and if so what's the replacement cost ?

And are these worth the price premium compared to buying a normal inverter + tubular batteries?

Any advice from the experts out here?

I am interested to understand more about this. Are they common in market now? How safe they are to use at home? Any suggestion on good brands available in India?

Luminous has such inbuilt inverters, I think even Hykon has, microtek has lithium battery - these are the usual suspects. In any case moving to Lithium was taken up by new brands in the market and they are doing very well. Small shops, farm houses, they all have them. I have seen a few large homes running on complete solar offgrid systems running lithium - everything from AC to Geyser runs on them.

My Nokia 3330 in college had a NICD \ or NIMH battery in the beginning, later on I changed it to a Liion battery, it was lighter and lasted a lot longer :D

I have a 1 kVA inverter located at the front hall and now that you raised the Hydrogen issue did a quick calculation on the back of an envelope:
For my inverter:
H₂ produced = 20 Ah × 0.05 to 0.1 L/Ah = 1 to 2 liters of hydrogen per day under extreme conditions - when it is gassing. The inverter electronics would not permit to that kind of charging.

It probably gives off about 300 ml of Hydrogen a day.
You need about 4 % concentration in the air to become explosive. My room is about 45000 liters of air by volume and it needs 1800 liters of Hydrogen to become explosive. I can sleep easy.

You can sleep easy (and thanks for the calculation) but not so easy if your inverter and battery were in closed boxes.

From the earlier days we never had the UPS/batteries in boxes. They were huge - 3 kVA always on type. The UPS itself weighed a little over 80 kg and a set of 12 batteries of 100 AH would need quite a bit of space.

Our earlier office built a metal cage in the front yard to accommodate 5 kVA UPS and batteries.

But I see in Post offices, they keep their inverters and batteries in the same hall. Must be their confidence in the 4 % not happening with their doors open.