How to solve the Alan Wake 2 battery amps stash puzzle

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This Watery cult stash in Alan Wake 2 requires you to solve an algebra problem

Alan Wake 2 cult stashes watery town algebra question about batteries and amps
(Image credit: Remedy)
Recent updates

October 7, 2025: We updated this guide as Alan Wake 2 is included in the PlayStation Plus Monthly Games for October 2025.

The Alan Wake 2 battery amp stash puzzle has a solution that you'll have to work hard for, as you need to use actual algebra to reveal the three-digit code that opens the crate. This starts with a note attached to the Watery town pier cult stash, which gives you the challenge to calculate how many amps battery B2 is worth using some limited starting information.

The survival horror direction of Alan Wake 2 means that puzzles are a given, but a full-on exam question certainly caught me by surprise – and it's not the only one! To save you the hassle of figuring this out yourself, I've crunched the numbers for the Alan Wake 2 battery stash puzzle below.

How to open the Alan Wake 2 battery cult stash and solve the B2 amps puzzle

The quick answer to this maths question for the Alan Wake 2 battery amps puzzle stash is that B2 has 496 amps. That means the code you need to enter for the stash's padlock is 4 9 6.

After opening the stash, I got shotgun shells, crossbow bolts, and a trauma pad, so it was worth solving for some supplies. Like the note inside, I'm sure you were just as surprised to find algebra in a survival horror game but there you go. Here's my working in case you want extra proof:

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  1. The first part of the question explains that B1, B2, and B3 total 1600 amps when added, therefore B1 + B2 + B3 = 1600
  2. The second part explains that B1 = 2B3 and B2 = B3 + 128.
  3. Substitute these into the original equation to get: 2B3 + (B3 + 128) + B3 = 1600
  4. Simplify that down and solve for B3:
    4B3 + 128 = 1600
    4B3 = 1472
    B3 = 368
  5. Therefore, B2 = 368 + 128 = 496
  6. Substitute it all into the original equation to check: 2(368) + (368 + 128) + 368 = 1600

If you've not already got it, make sure you grab the crossbow from one of the other Alan Wake 2 cult stashes in Watery – it's a pretty useful weapon to have, and there's quite a lot of ammo for it around the town. In the next chapter, you can also stumble across the Alan Wake 2 car and bike stash while in the Bright Falls woods.

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Will Sawyer
Will Sawyer
Guides Editor, GamesRadar+

Will Sawyer is a Guides Editor at GamesRadar+ with over five years of experience in writing online guides, news, and features, and has a BA (Hons) in Journalism. Starting as a freelancer, Will contributed to startmenu and Game Rant before joining the GamesRadar+ team in August 2021. Since then, he has written hundreds of guides about a huge range of games, with shooters and action games being his areas of expertise. Outside of writing about games, Will hops between multiplayer shooters with friends, such as Darktide and Helldivers 2, and delves into whatever has been on his backlog for far too long. He also tries to get through his never-ending Warhammer pile of shame of grey Tyranids, Aeldari, and Chaos Space Marines.

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