DOOM Eternal
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Sentinel Batteries - How to Get & Use
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DOOM Eternal
Sentinel Batteries - How to Get & Use

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Learn All Your Slayer Needs In This Beginner Guide

Read this DOOM Eternal guide to learn more about Sentinel Batteries! Find out how to get and use these items to unlock new skins, upgrades, & more facilities in the Fortress of Doom!

Table of Contents

Check Out The Fortress Of Doom Guide Here!

Recommended Sentinel Battery Upgrades

Get The Sentinel Crystals First!

Sentinel Crystals

There are 2 Sentinel Crystals that can be unlocked in the Fortress of Doom. Prioritize getting them as they can permanently boost your health, armor, and ammo capacity. You can even get a passive buff as a bonus!

Check Out The Sentinel Crystal Guide Here!

Get Modbots Next


The next upgrade you need are the Modbots as they give you an extra edge and more options in combat. Spend your next Sentinel Batteries getting these upgrades!

Check Out The Modbot Guide Here!

Praetor Suit Points After Mods

Praetor Suits After Mods

Praetor Suit Points are very numerous as you progress the levels of DOOM Eternal. After unlocking the Crystals and Mods, you can spend your batteries to get upgrades to your Dashes and Frost Grenades.

Check Out The Praetor Suit Point Guide Here!

Skins Are Last

Unlock Original Praetor Suit

Skins are only cosmetic and have no impact in combat. While you might look cool in battle, it's best to leave them last as the first 3 unlockables provide far better advantages and uses.

Check Out The Skin List Here!

What Are Sentinel Batteries?

Unlock Rooms In the Fortress of Doom

Unlock Rooms in the Fortress of Doom

The Fortress of Doom is the Slayer's main hub. When starting out, several of the rooms will be locked. However, you can slot in Sentinel Batteries to power up and open these rooms, allowing you to enjoy the upgrades and facilities within!

Check Out the Fortress of Doom Here!

Rooms Require 2 Batteries

Rooms Require 2 Batteries Each

Keep in mind that all rooms & facilities require 2 Sentinel Batteries to power up and unlock. You may need to look for several batteries if you plan on unlocking several rooms in a single trip!

Need 22 Batteries To Unlock Everything

You need to have a total of 22 Sentinel Batteries to unlock everything in the Fortress of Doom. As they are limited during the early stages of the game, use them on useful upgrades such as Sentinel Crystals and Modbots!

How to Get Sentinel Batteries

Found Via Exploration

Found Via Exploration

You will generally be able to find Sentinel Batteries by exploring levels. Keep in mind that some of these can be found in hidden areas, so be on the lookout for ledges, or anything of the sort that strays away from the beaten path. We've added their locations in our mission walkthrough!

All Sentinel Battery Locations

Click on a mission for more details about secrets.

Check Out Story Walkthroughs Here!

Use Fast Travel to Look For Sentinel Batteries

You can use the Fast Travel feature to instantly move to certain areas and see if there are any Sentinel Batteries that you've missed! This is a great way for you to double check and look through every nook and cranny for the batteries!

Check Out the Fast Travel Guide Here!

Complete Mission Challenges

Complete Mission Challenges
Click to Enlarge

You can also complete mission challenges to earn Sentinel Batteries! You can find these challenges on the right side of your HUD during the mission. You will only earn the Sentinel Battery once all 3 challenges are completed!

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