[mothered]

Yup. I like to act like a very young person to increase my success rates.
When I used the leaking battery method, I explained the liquid looked like "orange juice without the orange". This made the rep chuckle, and I was able to get the RMA

Being personable In a jovial manner provides a positive vibe and most Importantly, a sense of connection between yourself and the representative which (as you've experienced), can make all the difference In a successful outcome.

Well done.

Making representatives laugh especially if they're in a better mood is always best. If you get a cranky rep and they don't want to lighten up it's really a pain.

Definitely.

Even a simple "I hope you're having a wonderful day so far", brightens the mood of the representative, hence provides a little extra boost In compliance with your request.