@biznisdude , Brent Haynes, Is there any chance you could try and clean contacts and try camera before you buy.That way you could eliminate the gamble perhaps, solely cleaning contacts may not fix the fault. There is always a chance the problem may be internal,bad solder joint, loose wires, damage bent contacts, etc. If you can try cleaning battery terminals/contacts with a pen ink eraser(they are a little abrasive which will remove corrosion, but may have to be shaved down depending on the type of contacts to be cleaned). Stick the eraser end of the ink pen into your battery chamber, and scrub it across the battery contacts carefully not to damage the contacts, blow out any eraser shavings, dust/debri. You could also use Q-tip dampened in 90% isopropyl alcohol or a small piece of fine grain sand paper taped to a pencil, soft bristle tooth brush, long match stick, etc. After cleaned up, insert fully charged compatible battery and try camera.
I beleive this to be the correct battery for the Sony A7ll-(Sony NP-FW50 Lithium-Ion Rechargeable Battery 1020mAh).
The links to forums discuss this issue and have some suggestions on fixes for this error. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
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