Sentinel Batteries are one of the most important
collectibles in Doom Eternal because they’re used to open the various chambers in your Fortress of Doom hub. These chambers contain Doom Slayer skins, Praetor Suit Upgrades, secrets, and more. Not every level has Sentinel Batteries, but for those that do, we’ve tracked them all down for you.
Before you begin your hunt for Sentinel Batteries, keep in mind that most levels allow you to earn three Sentinel Batteries by completing mission-specific challenges. In order to unlock everything on the Fortress of Doom, you’ll need to complete those challenges and find all of the Sentinel Batteries hidden throughout the various levels.
Here’s a list of all the levels that contain Sentinel Batteries:
- Exultia
- Cultist Base
- Doom Hunter Base
- Super Gore Nest
- ARC Complex
- Mars Core
- Taras Nabad
Below you’ll find all Sentinel Battery locations organized by level. If you’re looking for additional help, be sure to check out the complete Doom Eternal guide.
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Exultia Sentinel Batteries
The first of the Sentinel Batteries is found on the campaign’s second mission. You are given this during the mission, so you don’t technically have to find it. Easy pickings!
There are three Sentinel Batteries to find on the Cultist Base level.
The first is in the area with two Revenants and some Zombies. After defeating them, turn around from the area you just came from. You’ll see a ledge off to your left.
Jump to it and break the wall. Hit the lever inside. This opens a gate underneath the broken bridge.
Head over there and take the Grav Lift up. At the top, dash across to the cave in front of you to grab the battery.
The second is in the room with an Extra Life up high. Kill the Cacodemon to your left and follow the path around to find it.
The last battery is after another battle with two Revenants and Zombies inside the facility.
From the elevator you exit, head forward and look for another one to your left. Ride that elevator down and exit into this room. Follow the path to find it.
Doom Hunter base has two Sentinel Batteries.
After a big fight with the walkway in the middle, drop down to floor level.
Look for a breakable vent underneath the walkway’s pillars. Smash it, drop down, and grab the battery.
The second one is in a floating area later in the level. Jump to the coffin climbing wall shown below.
Jump and dash across to the bar, and swing across to the building. Enter, kill the Zombies, and head to the back right-hand wall. The battery is nestled there.
Three Sentinel Batteries await you on the Super Gore Nest level.
In the toxic water area before you swing off a bar to break a wall up high, follow the toxic water path through the pipe in front of you to find the first battery.
The second is found after some platforming around spinning fireballs in the lava region. Once you scramble inside a building, the battery is to your left.
The final location is at the level’s end. Once you have the Blue Key, head back to the first battle area. Open the door to the Grav Lift by the Hellgrowth with the debris tornado above it.
Go up in the lift, look right, and dash to the climbing wall. Follow the path to your left all the way around, taking the Spectre out as you go.
The path opens into a room with busted windows. The Slayer Key is here, and a Sentinel Battery is on the far wall.
Three Sentinel Battery locations are present on the ARC Complex level.
The first is before you jump out of a broken window to follow your objective marker.
Head left up the stairs onto a balcony. Jump and dash across the gap. The battery is on your left alongside a secret to your right.
The second is down a long corridor in a room with Imps. Kill them, and then head into the room in front of you, via the door at the back, to grab it.
The last battery is in the purple sticky goo area. Head to the pillar at the back, inside the wire fence.
Punch a block out and climb up onto it. Jump and swing from the bar, immediately turn around and dash to the block in the other area. Grab the battery here.
Mars Core Sentinel Batteries
You can find three Sentinel Batteries on the Mars Core level.
After you drop down into the underground passage to grab the BFG-9000, turn around.
The battery is on a platform behind you. Jump over to grab it.
The second is in the Mars debris platforming area. Use the Grav Lift to propel you through the air. After you land, turn around and swing the bar behind you.
Land on another platform and then jump to the station above the Grav Lift. The battery is on the left.
The final location is in the Lost City of Hebeth. Drop down from the opening area and look right for it.
Grab yourself three Sentinel Batteries on the Taras Nabad level.
You can find the first after battling the Marauder at the beginning.
Head to the left of the platform, before the bridge into the city, and drop down onto a ledge. Turn around and break the wall. Head along the path to find this Sentinel Battery.
The second one is in the main courtyard area. Head to the stained glass windows on the upper level and follow the path to the right hallway. You’ll see a kneeling statue. Break it to reveal a button.
A gate near the entrance will open. Head back, climb up the wall, and break the chain holding a weight up. It’ll smash through the floor to give you access to the battery.
The last of the discoverable Sentinel Battery Locations is in the region with the fallen Titan. Looking at the Titan, turn to your back right side. You’ll see the battery there.
For more Doom Eternal guides, be sure to visit the complete Doom Eternal walkthrough. Here are a few other collectible secret guides to help you on your demon-slaying adventure:
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Joshua is Senior Features Editor at IGN. If Pokemon, Green Lantern, or Game of Thrones are frequently used words in your vocabulary, you’ll want to follow him on Twitter @JoshuaYehl and IGN.
