There is a Red Icon now as part of the Stock UI that pops up when you need to charge your weapons (and repair your armor). I thought it was on by default, but you can find the toggle somewhere in the game options. Just don't remember exactly where you toggle this on or off.
What you want is already part of the stock UI, well, visually anyway. I think this is better than a sound effect that might trigger once in a battle and not be heard.
Enjoy the game, life is what you really want to be worried about.
PakKat "Everything was going well, until I died"
Gary Gravestink "I am glad you died, I needed the help"
I searched far and wide and found that Awesome Info works well for me. Note also to take care of old mods THAT DO NOT BREAK THE GAME (my god read the comments carefully there are some mods that even supported that will damage a game let alone older ones) I have the addon Suppress Error Message.
Meet the LOST family: CP 1250+
Easily Lost Crafter - lvl 50 - Sorcerer Orc ( knows all traits and most styles )
Easily Lost-W - lvl 50 - Warden Imperial
Forever Lost - lvl 50 Sorcerer
CROWN CRATES: It doesn't affect gameplay, it's not mandatory, it's cosmetic only. If it helps to support the game and ZOS, I support it! Say YES to crown crates.