REVIEW – Most portable chargers I’ve owned die one of two ways. Dropped once too often, or forgotten in a hot car until the battery swells and I trash it before anyone asks questions. Dark Energy sent over the Poseidon Pro, a power bank built on the idea that the charger deserves the same armor everybody already equips to their phone. Waterproof, drop rated and built to a military durability standard, it makes my habit of throwing electronics into a bag full of loose tools, knives, and dog treats feel less reckless than it is.
Note: The Poseidon Pro was sent to me by Dark Energy at no cost. They had no editorial input and did not see this review before it published.
Photos and video by Gregory Morley.
The Basics
The Poseidon Pro is a 10,000 mAh power bank in a rugged polymer body with bumpered corners. It charges out through two USB-C ports and one USB-A, takes input over one of those USB-C ports, and carries an IP68 rating with the port flap shut, a MIL-STD-810G drop rating and a crush rating of 1,000 lbs.
Two buttons handle the controls. The left one is the mode button. Double-tap it for a 60-minute timer, or hold it for about three seconds for low power mode, which is what lets it charge small accessories that a normal bank ignores. The right one is the battery indicator. Press it once to check the charge level on the four LEDs, or hold it to reset the electronics if something isn’t behaving. Both take a firmer press than you would expect, and the unit is not always clear about whether it heard you.
What You Get
- Dark Energy Poseidon Pro power bank
- 3 ft (0.91 m) USB-C charging cable
By the Numbers
- Price: $99.99
- Capacity: 10,000 mAh, 38Wh
- Power output: 18W (12V at 1.5A)
- USB-C output: 5V/3A, 9V/2A, 12V/1.5A
- USB-A output: 5V/3A, 9V/2A, 12V/1.5A
- USB-C input: 5V/2.4A, 9V/2A, 12V/1.5A
- Water resistance: IP68 with the port flap closed, IPX7 with it open
- Durability: MIL-STD-810G drop rated, crush proof to 1,000 lbs
- Charge retention: 8 or more years
- Operating temperature: -20F to 120F
- Charge indicator: LEDs on the top face, four lights for 75 to 100 percent down to one light for 1 to 25 percent
- Dimensions: 6 x 3.25 x 0.63 in
- Weight: 9.6 oz (272 g)
- Controls: Left button double-taps for a 1-hour timer or holds for low power mode, right button presses once to check charge level or holds to reset the electronics
- Warranty: 2 years against defects
- Travel: Airplane safe, under the 100Wh limit
- Colors: Black, green, desert, hi-vis orange
Design & Build
The Poseidon Pro doesn’t try to hide what it’s built for. The textured body stays put in a sweaty hand or a wet pocket instead of sliding around the way smooth-sided banks do, and the bumpered corners give it real presence on a table. Four LEDs tell you exactly where you stand, which beats the single vague dot some chargers still ship with.
The ports hide behind a hard sealing flap with each one labeled on the outside, so you know which is which before you open anything up. It’s a small courtesy that saves fumbling in a dark tent or car.
Underneath the flap there are three ports, one USB-A and two USB-C. The middle USB-C is the one that handles input as well as output, that’s the port you want to remember when the bank itself needs feeding.
The underside carries the whole spec sheet molded into the case, capacity, wattage, the airplane-safe marking and the rating for every port.
This is a big charger, but it’s still thin enough to throw in a jacket pocket easily. The lanyard loop molded onto one edge is a nice touch and comes in handy on the trail or at camp.
Real-World Charging
10,000 mAh covers two to three full phone charges depending on the phone, and the dual USB-C outputs let me top off a phone and a set of earbuds at once without hunting for a second charger. That covers the entirety of my typical use case.
Recharging it hasn’t been the bottleneck I expected from a rugged design either. It comes back to full in a reasonable stretch rather than demanding an overnight sit. The same center USB-C port takes solar input, and Dark Energy tunes it for their own Spectre 18W panel if you want to charge it away from a wall.
I put a meter on both output paths to see what actually comes through. Over USB-C the Ampere app reported a steady 960mA into my Pixel 9 Pro, and over USB-A an inline meter read 5.13V at 1.05A, so about 5.4 watts. Both readings were taken with the phone already sitting at 90 percent, which is exactly where any phone throttles its own charging hardest, so treat those as what a nearly full battery accepts rather than as the ceiling this bank can deliver.
Living Up to the Rugged Claims
I didn’t go hunting for a lake to drop it in. It has ridden in a wet backpack pocket, taken a couple of unplanned trips off a counter, and been rained on more than once. A MIL-STD-810G claim is easy to print on a box and hard to earn, and nothing in the daily abuse this thing has absorbed around my place has made me doubt it.
One thing to understand about that IP68 rating though. It only counts with the port flap shut. Open the flap to plug something in and the rating drops to IPX7, which still covers rain and splashing but no longer covers submerging it. So weather is fine either way. What you can’t do is leave it sitting in a creek with the ports open.
What Could Be Better
The waterproofing has a caveat worth knowing. The full IP68 rating only holds with the flap shut, and Dark Energy’s own manual tells you not to submerge it with the ports exposed. Rain while it’s working is fine, anything deeper is not.
The two buttons are the one piece of hardware I would change. Both take a deliberate press to register, and the mode button’s confirmation is vague enough that I often cannot tell whether low power mode actually took until I go and check the LEDs myself. A stiff button on something sealed this well is a fair trade. Having to press it and then go check anyway is the wrong kind of uncertainty.
The seams around the port flap and its hinge collect grit, and a rubber gasket that gets opened and closed daily is a wear item. Neither has caused me a problem yet, and both are the parts I’d expect to fail first over a few years.
It also costs more than most 10,000 mAh banks, but I’d happily pay it for the sturdy, well-intentioned design.
Watch the Review
Quick Questions
Q: Is it waterproof while it’s charging something?
A: Partly. The IP68 rating applies with the port flap closed. Open the flap to plug in and Dark Energy rates it IPX7, so rain and splashes are still covered while it works. Submerging it with the ports exposed is the thing to avoid.
Q: How many phone charges does it hold?
A: Roughly two to three full charges from 10,000 mAh, depending on the phone.
Q: Can you recharge it from a solar panel?
A: Yes. Solar input goes into the same center USB-C port, and Dark Energy tunes the Poseidon Pro for their Spectre 18W panel.
Q: Does it have wireless charging?
A: No, not on this model.
Q: What ports does it have?
A: Two USB-C and one USB-A for output, with the middle USB-C doubling as the input.
Final Thoughts
The Poseidon Pro treats its indestructible pitch as an engineering brief rather than marketing filler, and weeks of careless handling haven’t given me a reason to doubt it. The one asterisk is that the full IP68 seal only holds with the flap shut, which is worth understanding before you buy it for exactly that feature.
For someone like me who appreciates over-engineered products built for the end of days, this is the power bank I’ll always grab first.
Price: $99.99
Where to buy: Amazon or direct from Dark Energy
What I like: Rugged build that has earned its rating so far, dual USB-C outputs, four-LED charge readout, useful cold and heat tolerance, 8-plus year charge retention
What I don’t: The full IP68 rating only holds with the flap shut, stiff buttons that don’t always confirm they heard you, and it costs more than most banks this size
