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I don't know about availability in India but lithium iron phosphate (LFP) batteries have come down in price a lot lately and they last about 7000 cycles (15 Years at 80% DoD): https://signaturesolar.com/eg4-lifepower4-lithium-battery-48...

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warranty 5 years on this one. theoretically even if breaks 1 day more than 5 years, there is no recourse so why assume it will last 15? tesla offers 10 years warranty on their powerwall so they are confident it will work at least for 10 years.

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