A big-time power bat is leaving the National League East.

Slugger Rhys Hoskins is leaving the Phillies and joining the Brewers on a two-year, $34 million deal, The Post’s Jon Heyman confirmed.

The deal comes with an opt-out after one year.

Hoskins emerged as a home run threat going all the way back to his rookie season in 2017, when he hit 18 homers in 50 games in 2017, finishing fourth in the National League Rookie of the Year.

In every full season since, Hoskins has hit at at least 27 home runs, most recently blasting 30 long balls in 2022 en route to the Phillies reaching the World Series.

His three-run homer off the Braves’ Spencer Strider in Game 3 of the NLDS that year was one of the pivotal moments of that series and most memorable of the entire postseason after he threw his bat down in jubilation.

Though Hoskins, 30, hit a high point during the playoffs that year with six long balls, things hit a low point when he tore his left ACL while fielding a ground ball in spring training.

After undergoing surgery, he missed the entire 2023 season.

The Phillies left open the possibility that he could return during this past year’s playoffs, but he ultimately did not play.

Hoskins provides the Brewers with an elite home run threat with 148 career round trippers and an .846 OPS, but his defense has always been a question mark.

In 2022, he ranked in the fourth percentile in all of baseball with minus-9 outs above average, according to Baseball Savant.

First base was an offensive black hole for the Brewers last year, as their players at that spot combined for a .231/.292/.389 slash line in 2023.