Help me to charge my battery more

An iPhone 7 that’s never had its battery swapped is quite possibly due for a battery swap, or for replacement; for a newer or new iPhone.

If capacity is at 80% or lower from the above check, or if otherwise fading very fast and with no obvious causes, the iPhone is headed for battery replacement, or for replacement.

iPhone Battery Repair & Replacement - Apple Support

makfirite ~ Does your iPhone 7 Plus still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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