I don't know if what just transpired is a point/counter point affair.
I am a trained and certified mechanic. I achieved both Journeyman-ship and a Craftsman-ship knowledge and skill level after serving an apprenticeship that I would consider extremely short. I was awarded my journeyman-ship after just 14 months as an apprentice.
That said, my experiences with customers has ranged from involved to delusional and everything in between.
When I state involved, I mean a customer who was interested in the source of the problem, wanted to know what actions I was taking and what each step in the process was going to cost.
When I state delusional, I mean a customer who wanted their air conditioning to work without me installing a new refrigerant charge. They didn't want to pay for the refrigerant and couldn't understand why the system was not going to work without it. I finally told them to take their business elsewhere.
I've had customers run the full gamut from the involved guy to the delusional idiot. I've had customers attempt to interfere with the process of diagnosis. I've had customers just tell me to fix it, and give them the bill after.
I've even had a customer tell me that they grew up in a shop and I didn't know what I was talking about. Specifically that their car wasn't leaking coolant despite the fact that it was pissing out on floor while we spoke about what I didn't know.
I came to the conclusion that there were two types of customer in the world. Ones I could deal with, and ones that I couldn't. I have a very low tolerance for stupidity. My wife says, I'm just not a people person. I think I am a people person, I'm just not a stupid people person.
What does all that have to do with a battery being installed and a bike still not starting? There are two types of customer. There are also two types of mechanic. One knows what they're doing. The other has no idea but fakes it well enough to get by...for a while. I've worked with both types. Some are better fakes than others and last an entire career. Others last just a few minutes.
This could be a case of the second type of mechanic and the second type of customer coming together. I don't know, I wasn't there.