Borderlands 4 Pester’s Grotto Ancient Crawler Guide – Battery Location & How to Clear It

Borderlands 4 is full of quirky side-objectives, and one of the trickiest ones is the Ancient Crawler activity in Pester’s Grotto. While these challenges don’t reward SDU tokens, they unlock unique cosmetics — making them well worth your time.

The catch? Each Ancient Crawler requires a battery, and in Pester’s Grotto, finding it can be frustrating if you don’t know exactly where to look. If your compass bugged out like mine, don’t worry — this guide will walk you through the entire process.

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Where to Find the Battery in Pester’s Grotto Ancient Crawler (BL4)

When you first reach the Pester’s Grotto Ancient Crawler, you’ll see the massive drill structure where the activity begins. However, the key to starting it is locating the missing battery.

Instead of searching directly around the crawler, turn your attention east of the structure. There’s a smaller pumping station, visible from the top of the crawler, where the battery is located. Pick it up there to start the sequence.

How to Install the Battery in the Ancient Crawler

With the battery in hand, head back beneath the crawler. In the center, you’ll find a grapple point above. Here’s the tricky part:

1. Toss the battery through the opening above, or place it on the ground so you can retrieve it after grappling up.

2. Grapple to the higher level and grab the battery again.

3. Head west and climb the stairs that lead you outward.

Reaching the Top of the Ancient Crawler

Once you’ve made it partway up, you’ll need to reach the very top to install the battery. There are two main ways to do this:

• Use the steam vent to launch yourself upward.
• Double-jump off one of the nearby boxes and glide to the middle deck.

From there, climb the ladder on the right-hand side to reach the highest platform.

Completing the Pester’s Grotto Ancient Crawler

At the top, slot the battery into the designated machine. This activates the Ancient Crawler and completes the side-objective, rewarding you with an exclusive cosmetic.

And that’s it — the Pester’s Grotto Ancient Crawler in Borderlands 4 is cleared! With practice, this one only takes a couple of minutes once you know the route.

The Ancient Crawlers in Borderlands 4 may seem like small distractions, but they’re a fun way to explore hidden areas and unlock cosmetics. The Pester’s Grotto Crawler in particular can be confusing because of the battery’s location, but now you’ve got a straightforward path to completion.

If you’re hunting cosmetics or just aiming for 100% completion, make sure not to skip this one!