Watt-hours tell you how much a power bank must replace.
mAh is the familiar label, but energy in Wh is what a power bank actually replaces. Compare sourced phone figures and keep Indian retail availability as a separate, unverified check.
mAh cannot be compared across voltages alone
Energy in Wh is voltage × amp-hours. A 37Wh power bank never delivers all 37Wh into a phone battery because conversion and charging loss take roughly a quarter, so planning estimates use a 75% delivered-energy allowance.
Availability is not part of the technical record
A sourced phone battery figure says nothing about an Indian retailer, INR price or warranty for that phone. Verify the exact model and seller separately before any purchase.
India pilot status: commerce closed. English is one entry point for India, not a claim that India is exclusively English-speaking. Hindi and other Indian-language editions can attach to this shared country layer after their own editorial and release reviews.