Prepper Disk Accessories Guide: Faraday Bags, Batteries, and What to Buy

The Prepper Disk gives your devices an offline window into maps, Wikipedia, and survival guides, but the gear around it decides how long and how safely you can rely on that window. Power keeps it running. Faraday shielding keeps it protected. This guide walks through the accessories Prepper Disk actually sells, what each one does, and how to decide which ones belong in your kit.

Start With Power: The 10-Hour Battery

An offline computer is useless the moment it loses charge, so a dependable battery is the first accessory most people should consider. The 10 Hour Battery (10,000 mAh) comes from a leading brand, either Anker or INIU, and ships with a USB-C charging cable. As the name suggests, it delivers roughly ten hours of runtime for your Prepper Disk device, enough to cover an evening of lookups during an outage or a long stretch off the grid.

If you live somewhere with frequent power cuts, or you plan to carry the device into the backcountry, pairing it with this battery is the simplest reliability upgrade you can make.

Prepper Disk 10-hour USB-C battery pack — The 10-hour, 10,000 mAh USB-C battery keeps the disk running through an outage.

Shield It: Faraday Defense NX3 EMP Bag

The EMP Protection Bag (Faraday Defense NX3) is one of the highest-rated bags on the market, according to Prepper Disk, and it is built for serious signal isolation. It uses triple layers of specialized metal-plated fabric containing nickel and copper shielding elements, which dissipate signals from both exterior and interior sources. In practice, that means it blocks Bluetooth, Wi-Fi, cell signals including 5G networks, GPS, and RFID.

Prepper Disk positions the NX3 as enterprise grade, designed for use by military, police departments, forensic investigators, government and executive travel, and anyone focused on personal data security, EMF reduction, and EMP protection. If your concern is keeping the disk and your phones isolated from tracking or an electromagnetic event, this is the dedicated solution.

Faraday Defense NX3 EMP bag holding a device in use — The NX3's triple-layer fabric blocks Wi-Fi, cell, GPS, and RFID signals.

Going Waterproof: GoDark Faraday Dry Bag

For wet environments, the GoDark Faraday Dry Bag (10 Liter) combines Faraday shielding with full waterproofing. It is designed so you can pack your Prepper Disk and the rest of your gear inside a single high-quality bag that protects against location tracking, hacking, electrostatic discharge, solar flare, and electromagnetic pulse.

The GoDark bag blocks incoming and outgoing EMF signals from cell phones, tablets, and other mobile devices between 200 MHz and 40 GHz, covering GPS, 4G and 5G cellular, Wi-Fi, and Bluetooth. Each bag is made with two layers of GoDark RF shielding fabric, which the brand states has been independently lab tested to exceed 100 dB of attenuation. Choose this over the NX3 if water resistance and packable volume matter as much as shielding.

The Smart Shortcut: EMP Bag and Battery Bundle

If you want both power and protection without choosing piece by piece, the EMP Bag and Battery Bundle packages them together. It includes a premium, rechargeable USB-C battery pack from Anker or INIU rated at 10,000 mAh with over ten hours of life, complete with a USB-C charging cord, plus the same Faraday Defense NX3 EMP bag described above with its three layers of cyber fabric.

The bundle is the most flexible single purchase for someone outfitting a new Prepper Disk, since it covers the two most important add-ons at once: keeping the device running and keeping it shielded.

Prepper Disk EMP bag and battery bundle — The bundle pairs the rechargeable battery with the NX3 EMP bag.

Shipping Abroad: The International Battery Guide

International customers face a wrinkle: due to air freight regulations on lithium batteries, Prepper Disk cannot ship portable power banks outside the United States. Rather than leave overseas buyers without a power plan, the brand publishes an International Battery Guide recommending a compatible battery sourced locally.

The minimum requirements it lists are straightforward, and most common power banks satisfy them: at least 10,000 mAh capacity, 5V/3A output or higher, a USB-C output port, and UL or CE safety certification. Example models the guide points to include the INIU Ultra Slim, the Anker PowerCore 10K, and the Ekrist Power Bank. If you are buying from outside the US, follow this guide so your disk has a reliable power source on arrival.

Building a Layered Kit

The accessories are not mutually exclusive, and many users combine them. A practical layered setup starts with the device itself, adds the 10 Hour Battery so it stays powered through an outage, and then adds a Faraday bag for storage and protection. If you expect rough or wet conditions, the GoDark Faraday Dry Bag does double duty as both your shielding layer and your waterproof carry. For travelers crossing borders, the International Battery Guide ensures the power side of that kit is covered even where Prepper Disk cannot ship a battery directly. Thinking in layers like this keeps the device dependable across very different situations, from a city blackout to a remote campsite.

How to Choose

Just want longer runtime: add the 10 Hour Battery.
Want maximum signal isolation: go with the Faraday Defense NX3 EMP bag.
Operate in wet or rugged conditions: choose the GoDark Faraday Dry Bag.
Want power and protection in one move: get the EMP Bag and Battery Bundle.
Ordering from outside the US: follow the International Battery Guide and buy a power bank locally.

The right accessories turn a Prepper Disk from a clever device into a dependable part of your emergency plan. Browse the full Prepper Disk lineup here and match the add-ons to where and how you expect to use it.