Where to buy replacement parts for batteries and ears?

I’m considering bringing our old CC3200 box into the Teddycloud in the long run. However, I’d also have to replace the battery and ears at the same time, as they’re starting to wear out after six years.

Are there current reputable sources for batteries and ears (internal parts)? Where do you order your replacement parts? Does it really matter where you order?
I’m a bit wary of cheap batteries and electronics, since the box would still be in the child’s room, especially at night.

Thanks for your help

For the ears I can recommend the Shop

Batteries. Don’t buy the cheapest, don’t buy the most expensive ones. Can not recommend any certain.