I have installed the grips on Piaggio MP3 250 and on Honda Supra X 125 HelmIn, Piaggio Medley 125, etc. They are worth every last euro you have.

1) Power.
The cables are connected directly to the battery.
Even if you don't know, the installation is simply ridiculous. Without having knowledge in electronics, I installed them by myself.

If you take it to a mechanic, the only thing that will delay you is the putting on and taking off of the plastics.
It draws a little power from the battery and has a built-in safety feature in the cable to prevent overvoltage and damage to other parts of the motorcycle.

2) Heat.
Certainly, there are better grips, but these remain reliable. They heat up very well, and if someone does outdoor work like a delivery person, with grips like Shad/Tucano urbano, they complete the best protection.

3) Wear.
There was no sign of wear on any bike. They have scratches that can be removed in 2 minutes during the summer, and you can put them back on in the winter. They do not destroy the motorcycle's grips, and if they break, you can give 30€ and buy a pair of new grips. The rest of the joining mechanism remains intact.
If you install other grips, apart from having to solve the whole bike, the cost is 3 to 5 times higher.

I use short gloves in winter and summer. When it rains, as soon as you activate the grips, your hands dry in 2-3 minutes, and the gloves dry from the water that has fallen on them.

In summary, they have never created a problem and especially for bikes with small batteries like scooters, they are the best choice considering their value.

Buy without fear.