Hi, In fact I never use before weight plates under battery.
I just want to know if the weight plates would stick on chassis or in the battery.
If anyone want share also about what kind of tape and how to stick with it, please?

Best regards

I've always stuck them to the bottom of the batter with double-sided very thing pieces of tape.

I've always struck then to the chassis (no need to add weight to all your batteries, just to the car). The ones I've bought in the past have always come with thin double sided tape, and that's what I'd use, no need for thick tape which wastes space.

3M 5925 ( .6mm thick) https://www.3m.com/3M/en_US/p/d/b40072038/
3M 5908 ( .25mm thick) https://www.3m.com/3M/en_US/p/d/b40065685/

I believe the batteries must be attached 1 by 1 with plates, of course is really expensive in case you have 3 or 4 packs, the another problem is low of plates you can find in stock.
Anyway, thanks!

wow, these 3M are really something, I never saw these on the mall, maybe I need to check this in online, thanks!

Tesa 4965 is my go to double sided tape for really thin attachment to a chassis. Works well for plates, ESCs, transponders, tungsten cube weights for ballast, whatever. It holds well, best if everything is degreased and given a bit of full-bond time before stressed, but it'll work if you're in a hurry as well.

Sam Isaacs put me on to the stuff, and it's pretty much replaced all my other "servo tape" options used previously.

What’s the purpose of a battery weight plate?

To add weight below the battery.