help 1965 full movie Said:
"The error message went away once the battery died and it came back on."
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Time for a New Battery or a New iPhone:
The battery is apparently damaged. So, seek out a new battery or a new iPhone. Being so old of a device, I recommend you look into getting a new iPhone, rather than just purchasing a new battery.
Erasing After Transferring to a New iPhone:
When transferring, this is the Quick Start is the best route to date: Use Quick Start to Transfer Data to a New iPhone or iPad - Apple Support. So, once transferred, reset your iPhone to Factory settings --perform as instructed here, including the backup creation and iCloud out: What to do Before you Sell, Give Away, or Trade in your iPhone or iPad - Apple Support