Cyberpunk Battery Killer?

Title.

I finally got a chance to come around and buy cyberpunk on a sale with DLC. Love the game, having a great time playing on my Steam Deck. 10/10.

After putting in about ~40 hours, I now notice my Steam Deck's battery will jump at times to being full, to giving the 10% warning rather quickly. Is my battery cooked? Game too stronk?

Just curious if others have had similar experiences. Thanks!

Using 1st Gen 512GB Steam Deck.