Answer to "Why do I get a batteries exhausted error?". . . . because the batteries WERE low. Old batteries , too long in the HOT garage and my "battery checker" was lying to me about the battery's charge. Use voltmeter to get a true state of new or used batteries.
Answer to "Why do I get a batteries exhausted error?"This only happens to me when I am used the video mode. I NEVER use rechargeable batteries, and the new batteries have the same problem. My guess is bad software or bad battery door. Door is a very cheap design.