Why this happened with iphone battery?

Ok i never faced this issue before,
When i plugged in charger in morning it shown "plug" sign where it should show "lighting thunder" sign.
I plugged out & again plugged in and shown "lighting thunder" sign & started charging.
After reaching 92 percent i noticed battery percent is not increasing,
I switched off/on
It shown me battery percent 96 percent,
Again above issue started it shown "plug in" sign.
Then i discharged it to 15 percent and plugged in charger,
Now its charging normally as before,
Please tell where is actual problem,
I have noticed that battery drainage is well as it was before,
But why it didn't charged to 100 percent.
I add i plug in charger always when its above 45 percent, i mean i never fully discharged and recharged it.

You need a new charger

If you have a car charger chord try that and if thats fine then its an issue with the chord.

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