Question [Q] Help with Kernels and ROMs

Hello all!

I am new to this forum and I've been using a Moto Defy froyo 2.2.1 green lens for a bit more than 2 years.

Recently I've been wanting to customize it, mainly because the battery life issue.

So I was wondering what kernel and rom could I flash in order to improve battery life and have an overall great experience with my dated smartphone.

And just in case I want to downgrade what would be the suggestion.

Thank you very much!