Which kind of Rock Space power bank listed below would you prefer to buy with 1000 INR differences between each kind?

20000 mah (can charge 5 times for an iPhone)
13000 mah (can charge 3 times for an iPhone)
10000 mah (can charge 2 times for an iPhone)

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None of them.

I would use my phone in such sensible ways that I wouldn't need a power bank.