diff --git a/src/data/arena-tag.ts b/src/data/arena-tag.ts
index 12abe3f1b6e..7910d257f3d 100644
--- a/src/data/arena-tag.ts
+++ b/src/data/arena-tag.ts
@@ -295,7 +295,8 @@ export abstract class WeakenMoveScreenTag extends SerializableArenaTag {
       if (bypassed.value) {
         return false;
       }
-      damageMultiplier.value = globalScene.currentBattle.double ? 2732 / 4096 : 0.5;
+      // Screens are less effective in Double Battles
+      damageMultiplier.value = globalScene.currentBattle.double ? 2 / 3 : 1 / 2;
       return true;
     }
     return false;
diff --git a/src/data/moves/move.ts b/src/data/moves/move.ts
index 85a7563add3..4083bfa39b5 100644
--- a/src/data/moves/move.ts
+++ b/src/data/moves/move.ts
@@ -11450,9 +11450,9 @@ export function initMoves() {
     new AttackMove(MoveId.RUINATION, PokemonType.DARK, MoveCategory.SPECIAL, -1, 90, 10, -1, 0, 9)
       .attr(TargetHalfHpDamageAttr),
     new AttackMove(MoveId.COLLISION_COURSE, PokemonType.FIGHTING, MoveCategory.PHYSICAL, 100, 100, 5, -1, 0, 9)
-      .attr(MovePowerMultiplierAttr, (user, target, move) => target.getAttackTypeEffectiveness(move.type, user) >= 2 ? 5461 / 4096 : 1),
+      .attr(MovePowerMultiplierAttr, (user, target, move) => target.getAttackTypeEffectiveness(move.type, user) >= 2 ? 4 / 3 : 1),
     new AttackMove(MoveId.ELECTRO_DRIFT, PokemonType.ELECTRIC, MoveCategory.SPECIAL, 100, 100, 5, -1, 0, 9)
-      .attr(MovePowerMultiplierAttr, (user, target, move) => target.getAttackTypeEffectiveness(move.type, user) >= 2 ? 5461 / 4096 : 1)
+      .attr(MovePowerMultiplierAttr, (user, target, move) => target.getAttackTypeEffectiveness(move.type, user) >= 2 ? 4 / 3 : 1)
       .makesContact(),
     new SelfStatusMove(MoveId.SHED_TAIL, PokemonType.NORMAL, -1, 10, -1, 0, 9)
       .attr(AddSubstituteAttr, 0.5, true)
diff --git a/test/moves/aurora-veil.test.ts b/test/moves/aurora-veil.test.ts
index 3c7c86c7fdf..6edc214d580 100644
--- a/test/moves/aurora-veil.test.ts
+++ b/test/moves/aurora-veil.test.ts
@@ -19,7 +19,7 @@ describe("Moves - Aurora Veil", () => {
   let phaserGame: Phaser.Game;
   let game: GameManager;
   const singleBattleMultiplier = 0.5;
-  const doubleBattleMultiplier = 2732 / 4096;
+  const doubleBattleMultiplier = 2 / 3;
 
   beforeAll(() => {
     phaserGame = new Phaser.Game({
diff --git a/test/moves/light-screen.test.ts b/test/moves/light-screen.test.ts
index c8282037f20..b6eb2725346 100644
--- a/test/moves/light-screen.test.ts
+++ b/test/moves/light-screen.test.ts
@@ -19,7 +19,7 @@ describe("Moves - Light Screen", () => {
   let phaserGame: Phaser.Game;
   let game: GameManager;
   const singleBattleMultiplier = 0.5;
-  const doubleBattleMultiplier = 2732 / 4096;
+  const doubleBattleMultiplier = 2 / 3;
 
   beforeAll(() => {
     phaserGame = new Phaser.Game({
diff --git a/test/moves/reflect.test.ts b/test/moves/reflect.test.ts
index b8fa2b1ce80..426027d3f31 100644
--- a/test/moves/reflect.test.ts
+++ b/test/moves/reflect.test.ts
@@ -19,7 +19,7 @@ describe("Moves - Reflect", () => {
   let phaserGame: Phaser.Game;
   let game: GameManager;
   const singleBattleMultiplier = 0.5;
-  const doubleBattleMultiplier = 2732 / 4096;
+  const doubleBattleMultiplier = 2 / 3;
 
   beforeAll(() => {
     phaserGame = new Phaser.Game({