Confused about charging my iphone 15 pro

tamim06 wrote:

I have the original 20 watt charger but my phone battery is draining too fast with that. That’s why i am thinking to use low capacity charger sometimes. Thing is it will not harm phone’s battery right?

The capacity of the charger will up to a point, affect how fast the battery charges. It has no effect on how quickly it discharges.

If it’s a USB-C connection then you can charge your iPhone with it. The iPhone is only going to use what it needs, if the adapter provides more power then the phone can handle, the phone is only going to use what it needs. If you have a charger that doesn’t provide what the phone needs for full speed charging, then it is going to charge at a slower pace.

5W adapter will not harm your iPhone but surely will not Fast Charge your iPhone.

I would personally recommend you to use MFi-certified adapters.