Buy Now — $49.99
Pocket-sized. Waterproof. MagSafe-ready. Built to hold a charge for years — and deliver it the moment you need it most.
Get the Poseidon Nano — $49.99 →You know the feeling. You're halfway through a hike. Your GPS is dying. Your car is parked three miles back and you can't remember the trail junction. Or maybe it's simpler — you're running between meetings, your Uber is two minutes away, and your phone just gave you the low-battery warning.
Most people carry nothing. They hope for the best. They look for a wall outlet in a coffee shop. They ask a stranger to borrow their cable.
And the power banks that do exist? They're either the size of a brick — so you leave them at home — or they're cheap, unreliable, and dead after six months in a drawer.
"Most of us don't think about backup power — until we wish we had it."
There's a better way. And it fits in your pocket right now.
Dark Energy built the Poseidon Nano for one purpose: to be the backup you actually carry. Not the one sitting on your desk. Not the one you forgot to pack. The one clipped to your keys, tucked in your jacket pocket, or snapped magnetically to the back of your phone before you walk out the door.
At just 3.8 ounces and thinner than most wallets, you won't even notice it's there — until the moment you need it.
And when that moment comes? The Poseidon Nano delivers 50–70% of a full phone charge. Enough to call for help. Enough to navigate home. Enough to finish the day.
50 VERIFIED REVIEWS · POWERED BY JUDGE.ME
I got this to bridge the gap between work and home or if I am out hiking in the backcountry. I was looking for a smaller lightweight charger and this is perfect. The secret to using it is to attach it at about 50% and it charges full on my 17 Pro Max. For backup charging and emergencies this is the best I found. One hack I found for faster charging is to plug the phone into the battery and you will double the charging speed.
It's a good product for what it's designed to do — give you a quick charge when you need it most. I bought this with that in mind and it works great. But if you're looking for something that'll charge your phone quick to 100%, I'd recommend its big brother the Poseidon Pro.
Works nice.
| POSEIDON NANO | POSEIDON PRO | |
|---|---|---|
| Price | $49.99 | $99.99 |
| Charge Output | 50–70% of a phone | 2–3 full charges |
| Outputs | USB-C + MagSafe | 2× USB-C + USB-A |
| Waterproof | IP67 | IP68 |
| Form Factor | Pocket-sized | Phone-sized |
| Weight | 3.8 oz | 9.6 oz |
| Best For | Everyday carry / EDC | Multi-day trips |
| Warranty | 5 Years | 5 Years |
Press the Dark Energy logo on the front — that's your power button. The Nano stays active while charging a device, then automatically shuts off after a short period of inactivity to conserve power.
The Poseidon Nano delivers about 50–70% of a full phone charge, depending on your phone's battery size. It's designed to give you a reliable boost when you need it most — not a full top-up.
MagSafe requires a compatible iPhone (iPhone 8 and newer). If your case is too thick, made of metal, or not MagSafe-compatible, it can block the magnetic connection. Try removing your case.
Yes. All power banks generate some heat during use, especially during wireless charging. This is normal and safe.
Absolutely. The USB-C output works with any USB-C device — Android phones, GPS units, radios, headlamps, cameras, and more.
Dark Energy stands behind every product with a 5-year warranty against defects in materials and workmanship. Visit darkenergy.com/pages/warranty for full details.
The Poseidon Nano is $49.99 with free shipping and a 5-year warranty. It's the last power bank you'll ever need to carry — because it's the only one you'll actually have with you.
Order the Poseidon Nano — $49.99 →placeholder
