The battery is loosing power quickly. The battery loose power when charging.

Dmlsr1 wrote: "Yes, Original battery. Battery Health says it’s significantly degraded and it’s at 65%."

Well, that explains the problem! Have the battery replaced and all will be well:

iPhone Battery & Power Repair

About genuine iPhone batteries

Repair Provider Verification

(Articles found by searching Apple's Knowledge Base.)

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Dmlsr1 wrote: "device is a iPhone 7plus"

And, again, does it still have its original battery?

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

Settings > Battery > Battery Health

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Dmlsr1 Said:

"The battery is loosing power quickly. The battery loose power when charging.: How do I stop the battery from loosing power too quickly and when charging?"

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Troubleshooting iPhone Battery Drain Info:

The iPhone battery will drain, unless it is plugged in and charging. With lots installed, the charge would be slower. As for how fast it would drain the battery, that would depend on the battery health and the volume (sound) you use.  Go Here: iPhone Battery and Performance - Apple Support - Scroll down to "Your battery's maximum capacity"

Troubleshooting the Battery:

• iPhone Battery and Performance - Apple Support

• Charge and Monitor the iPhone Battery - Apple Support

• About the Battery Usage on your iPhone - Apple Support

• About Optimized Battery Charging on your iPhone - Apple Support

• Use Low Power Mode to Save Battery Life on your iPhone - Apple Support

• If you see "Your iPhone Battery may Need to be Serviced" - Apple Support

Dmlsr ~ What model of iPhone is it?...

Settings > General > About > Model Name

Does it still have its original battery?

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

Settings > Battery > Battery Health

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iPhone 11 and later models, battery performance --> About the battery and performance of iPhone 11 and later