Valentine's day! :laughing:
As for "Mr Potter", who must be a millenial because the best he can do for research is type on his smart phone.
Get off your bum and talk to some local mowing companies.
Better still offer to work for some of them for free to do your research.
Nothing like first hand experience, that is REAL research.
If I caught one of my students doing this when I was teaching it would be an automatic fail.

You seem nice.You're talking nonsense! Whatever the battery is, after two years it loses its properties.
Nothing like the truthYou're talking nonsense! Whatever the battery is, after two years it loses its properties.