If I’m worried about battery life I prefer to plug my iPhone or iPad into my portable speaker instead of using the BT since it does use more power

I have portable speakers that have the old-school iPhone connector and an audio cable connector.

The cable is 6 feet long, which is a convenient size for carrying with you to connect an iOS mobile device to portable speakers, larger home system speakers, or an automobile speaker system.

This cable can also be used to connect the iPhone to a 3.5mm port of a portable speaker or sound system