For many of us, an external battery pack comes in near the top of our accessory priority list. Whether you travel for work or pleasure, topping up your gadgets on the go can be important, and that need can extend into durations or locations that require a few extra features or added durability. So, for all you outdoorsy types prepping for summer trips, we're taking a quick look at two new RAVpower batteries. One is "waterproof," both are solar-powered, and they clock in at 10,000mAh and 25,000mAh respectively. 

Before you get too excited about harnessing the functionally infinite power of the sun for yourself, keep in mind that the small size of the solar panels equates to a pretty slow charging speed. You won't be topping either of these batteries up to full just laying them out in the sun for the day. At the fastest possible speeds, it might give you, say, an extra 800-1200mAh per day. They're more perk than point if you decide to pick one up. Even so, it's an extra free bit of power that could make a difference out on the trails, giving your electronic safety net the ability to replenish itself without an outlet.

The larger 25,000mAh battery offers a durable rubber-encased "waterproof" design with plenty of capacity, while the smaller 10,000mAh battery brings solar power to a pocketable form-factor. In my opinion, it's the bigger battery that's worthy of your attention, but either way, we've also got a pair of exclusive coupons (good until the end of July) that make them both a little cheaper.

RAVPower 25,000mAh outdoor battery w/ USB-C

This is the larger of RAVPower's two new solar-charging batteries, and it's the one I'm most likely to recommend. It has all of the basics you expect, including USB-C and some level of undefined "Quick Charge" functionality over USB-A, presumably compatible with Qualcomm's QC tech. It's also advertised as "waterproof," and while I'd be hesitant to jump into a pool with it, the design does seem to offer some reasonable resistance.

At the list price of $52.99, it's a bit steep compared to the multitudes of similarly-sized batteries out there, but the extra solar panel and "waterproof" design justify a bit of a premium. Thankfully for our readers, RAVPower is offering an exclusive limited-time coupon (APRAVPB083), bringing the price down to $39.99.

So, how much does that get you?


Capacity 25,000mAh
Input "Quick Charge" Micro-USB 5V/2A, 9V/2A, 12V/1.5A; USB-C 5V 3A; Micro-USB+USB-C 5V/4A
Solar charging 5V 300mA
Outputs 2X USB-A + 1X USB-C: "Quick Charge" USB-A 5-6.5V/3A, 6.5-9V/2A, 9-12V/1.5A; USB-C 5V/3A; USB-A 5V/2.5A
Dimensions 9.2" x 3.9" x 1.5" (233mm x 99mm x 38mm)
Weight 19.4 oz (550g)
Warranty 18-month, plus 12 more after registration
Price $52.99 ($39.99 w/our code APRAVPB083, valid until the end of July)

The Good

Capacity 25,000mAh is nothing to sneeze at.
Build quality I'm not 100% sure I'd call it legitimately "waterproof," but it is certainly durable, and I wouldn't be too worried about splashes or small drops.
Ports A lot of more durable products also go with dated specs, having USB-C in a waterproof battery is good.
Price For just a tiny bit more than a normal battery of this size, you get the added bonus of solar charging. That's pretty swell.

The Not So Good

Ports, again I'd have liked them all on the same edge, and more than one USB-C port would be nice.
Power It doesn't spit enough to charge a higher-wattage laptop.
Solar panel It might technically be able to take power via sunlight, but it's very slow to charge that way.
Annoying light There's a green LED on the front that is always on whenever the battery is getting enough light to charge, and it's a bit annoying.


It's a battery, so by need, it must be a brick. That means you get six chunky sides, with a solar panel on one of the larger faces, bordered on all the shorter edges by solid rubber. The back is plastic with a soft-touch rubber coating, a power indicator button, and four LEDs denoting charge. All the ports live in two groups along the rubber edge, covered by attached rubber plugs.

Altogether, this rubber ringed, sealed design is meant to be "weatherproof," but there are some gaps in the material's coverage beneath the plugs covering the inputs/outputs. I wouldn't put too much faith in it actually being waterproof, but it should stand up to some splashing and most outdoor use (short of falling into a lake).

On the top edge is a metal ring for attaching or hanging the battery to something like a backpack or a tent pole. The opposite end houses a decently bright flashlight, controlled by long-pressing the power button on the back.

Included with the battery are 2 Micro-USB cables, one slightly sketchy looking Micro-USB to USB-C adapter, and a flimsy carabiner.


The pure specs from my tests are as follows:

  • 84.1 Wh capacity (measured from the lower USB-A port at 5V/2A over 8:24).
  • Overcurrent protection/maximum output of 5V/3.3A (measured from both USB-A ports).
  • USB-C ~15W max output.

It's able to take a charge simultaneously from both USB-C and Micro-USB, and I don't have the gear to measure both simultaneously, so we'll have to accept the OEM's provided numbers for max rates. I will note, charging time over USB-C is quite long. After the full drain to test capacity, an overnight charge from a 2.4A source was not sufficient to top it up completely.

I can't measure charging rates or time realistically when it comes to the solar panel, but anecdotally it is very slow. If the specifications are to be believed, it provides power to the battery at a maximum of 5V/0.3A which is... not a lot. A couple weeks of direct sunlight might be required to fully charge it.

It's also worth noting that my Pixelbook—which is notoriously picky when it comes to power—refuses to pull power from it at all over USB-C.

RAVPower 10,000mAh solar-charging battery

The smaller of RAVPower's new batteries is both less expensive and less durable. At a list price of $29.99, ($19.99 with our coupon code APRAVPB082) the 10,000mAh model still sports a solar panel, but there's no waterproofing here.

Half the price gets you less than half the capacity and fewer useful outputs, cutting down from 3 to 2 as it loses USB-C. There are only USB-A outputs and Micro-USB input.


Capacity 10,000mAh
Input Micro-USB, up to 5V up to 2.1A
Solar charging 5V 200mA (advertised)
Outputs 2X USB-A, 5V 2.1A combined, up to 5V 2.1A max per outlet.
Dimensions 6.9" x 3.4" x 0.6" (175mm x 86mm x 15mm)
Weight 9.8 oz (278g)
Warranty 18-month, plus 12 more after registration
Price $29.99 ($19.99 w/ our code APRAVPB082, valid until the end of July)

The Good

Thin Not the slimmest in this capacity range, but 0.6" is small enough to pocket, and smaller batteries don't have solar panels.
Price Again, $30 list price is in line with (or a bit cheaper than) many other batteries of similar capacity, and you get a solar panel.

The Not So Good

No waterproofing Unlike the bigger brother, this model is just encased in plastic.
No USB-C This is the big deal-breaker, who wants to carry an extra USB-C to A cable in 2018?
Charging Micro-USB input is meh.
Solar panel It's very slow to charge from it.


This smaller battery is very different from its larger cousin when it comes to features and materials. It's still a brick, but it's thinner and less durable, encased entirely in matte black plastic. It also has a solar panel for charging, but this one is a bit smaller.

All this battery's business is localized to the same side, with both outputs and a dimmer flashlight on the bottom edge. The power button is near that end on the left edge, while the Micro-USB input is in the same spot on the right. The LEDs for power level are at the bottom on the front.

This smaller battery can also be hung up like its bigger brother, but this time by a flimsier plastic loop.

Included with the battery are two Micro-USB cables.


Pure specs from tests are as follows:

  • 33.1 Wh capacity (measured from USB-A at 5V/2A over 3:17).
  • Overcurrent protection/maximum output of ~2.75-3A (measured from USB-A).

Although my tester was able to manually request up above 2.5A, none of my devices were able to exceed that rate. The largest real-world numbers I saw were 5V/2.3A with a MacBook Pro.

This smaller battery understandably fills up more quickly than the more capacious model, reaching a full charge easily overnight. Again, I can't actually measure the rates the solar panel provides the battery, but with an advertised 5V/0.2A maximum, it probably won't supply a full charge without a week (or more) of sunlight.

Should you buy them?

If you're the outdoorsy type who goes camping or hiking a lot, and you need something with some extra durability to keep a device topped up, the larger 25,000mAh battery should probably be on your shortlist. It's waterproof-ish, shock-mounted and durable, with a metal hanging hook and a range of outputs, plus a solar panel. It won't charge purely from sunlight very fast, but it might grab just a bit of extra power during the day as it's slung on your pack. The ~15W output limitation over USB-C could be a deal breaker if you hoped to use it with a laptop or more power-hungry device, though.

The 25,000mAh battery is waterproof, durable, and a decent value. The same can't be said for the smaller 10,000mAh model.

On the other hand, unless you need a solar panel and you're willing to skip USB-C support, I'd probably steer clear of RAVPower's smaller 10,000mAh battery. There are other slightly more expensive (though solar panel-less) models out there that support faster charging standards and USB-C. The difference really is worth it if your phone supports either.

RAVPower's batteries are sold exclusively through Amazon, and the company has offered our readers coupon codes for both models that are good until the end of July.