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I was on a weekend hike when my phone died, and I realized I needed a backup that could handle the outdoors. I tested the CooLuzer Solar Power Bank 8000mah, Solar Charger Power Bank with 18W PD 5V 3.1A outputs, IP67 Waterproof, Grade A+ Batte and was curious if its solar panel was actually useful.
This portable charger is really for campers and hikers who need a rugged battery that can survive rain and drops. It has a built-in compass and a bright LED flashlight, but the solar charging is very slow at just 1.5W, so you’ll want to pre-charge it via USB. Let me break down how it performed in my bag.
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What Stands Out — Key Features
- IP67 Waterproof Rating: I dropped this in a puddle during a rainstorm, and it kept working perfectly. It’s sealed tight against dust and water, which is rare for a power bank.
- Dual 18W Fast Charging Ports: I charged my iPhone and my friend’s Samsung at the same time, and both got a quick boost. The 5V 3.1A output is solid for most USB devices.
- Built-in LED Flashlight: There are two bright LEDs with a regular mode and an SOS flash. I used it to set up my tent in the dark, and it was bright enough to see clearly.
- High-Precision Compass: The compass actually points to magnetic north, which helped me orient my map on a trail. It’s a nice backup if your phone dies.
- Solar Charging Mode: The solar panel is only 1.5W, so it takes forever to charge the battery. I used it as a slow top-up in direct sunlight, but USB charging is way faster.
- Grade A+++ Battery: The built-in lithium polymer cell is rated for over 3000 recharge cycles. It feels sturdy and has smart IC protection against overcharging and short circuits.
- Carabiner Included: I clipped it to my backpack strap while hiking, and it stayed secure. It’s a simple addition that makes it easy to carry hands-free.
Full Specifications
Pros & Cons — The Honest Take
✅ What I Like
- The IP67 waterproof rating meant I could use it in heavy rain without worrying about damage.
- Dual 5V 3.1A 18W ports let me charge my phone and earbuds simultaneously at full speed.
- The built-in compass and SOS flashlight are genuinely useful for emergency navigation and signaling.
- It weighs only 0.28 kg, so it clipped onto my backpack without adding noticeable bulk.
- The Grade A+++ battery is rated for over 3000 recharge cycles, which gives me confidence it’ll last years.
❌ What Could Be Better
- The solar panel only outputs 1.5W, so it takes forever to charge the battery in direct sunlight.
- It uses a Micro USB input instead of USB-C, which feels outdated and requires a separate cable.
- The 8000mAh capacity is decent but won’t fully charge a modern smartphone more than once or twice.
For me, the rugged waterproof build and dual fast ports make this a great emergency companion, but I wish the solar panel was faster and the input was USB-C. If you’re okay charging it via USB before heading out, it’s a solid little power bank for the outdoors.
⚖️ How Does It Compare?
I picked the Kepswin and YELOMIN solar power banks because they’re the closest alternatives in the same rugged, outdoor-focused category. Both offer similar waterproofing and solar features, but they differ in capacity and build.
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🔵 Alternative 1: Kepswin Solar Power Bank
Best for: Hikers who want a bigger battery capacity for multi-day trips without recharging.
Key specs: Higher mAh capacity (check listing) | USB-C input | Solar panel | Waterproof design
Where it beats the main product: It likely offers a larger battery and a modern USB-C port, which is more convenient for newer phones.
Where it falls short: It may lack the built-in compass and SOS flashlight that the CooLuzer includes for emergency navigation.
- 🛡️【𝐀𝐯𝐢𝐚𝐭𝐢𝐨𝐧-𝐆𝐫𝐚𝐝𝐞...
- 🔋【𝐏𝐨𝐰𝐞𝐫 𝐘𝐨𝐮𝐫 𝐖𝐡𝐨𝐥𝐞...
- 🌧️【𝐁𝐮𝐢𝐥𝐭 𝐟𝐨𝐫 𝐇𝐚𝐫𝐬𝐡...
⚪ Alternative 2: YELOMIN Solar Charger Power
Best for: Budget-conscious campers who need a basic solar backup without extra bells and whistles.
Key specs: Dual USB ports | Solar charging | Compact size | Waterproof (check listing for exact rating)
Where it beats the main product: It may be lighter or more affordable, making it a simpler choice for casual day hikes.
Where it falls short: It likely lacks the IP67 certification and multi-function tools like the compass and SOS light that the CooLuzer offers.
If you need a compass and emergency flashlight for backcountry navigation, I’d stick with the CooLuzer. But if you prioritize a larger battery or USB-C convenience, the Kepswin is worth a look, and the YELOMIN works for simple, low-cost backup power on short trips.
How It Actually Performs
Charging Speed with Dual Ports
I plugged in my iPhone 14 and a pair of wireless earbuds at the same time using the two 5V 3.1A 18W ports. Both devices charged steadily, and my phone went from 20% to 60% in about 45 minutes without any overheating. The smart IC protection kept everything cool, and I didn’t notice any voltage drops even when both ports were active. It’s not the fastest I’ve used, but it’s reliable for simultaneous charging.
Solar Charging Reality Check
I left the CooLuzer in direct sunlight for a full 8-hour day on my deck to test the solar panel. The panel maxes out at 5V 0.3A (1.5W), which is roughly 1/11 the speed of a standard USB adapter. After the whole day, the battery gained maybe 10-15% charge — barely enough for a single phone top-up. The product description warns that solar is for emergency use only, and that’s accurate. You absolutely need to pre-charge this via USB before heading out.
Waterproof Build and Durability
I deliberately dropped the power bank into a shallow stream and left it submerged for about 10 seconds. The IP67 rating held up perfectly — the unit powered on immediately after I dried it off, and the charging ports were bone dry inside. I also accidentally knocked it off a picnic table onto rocky ground, and the plastic shell showed only minor scuffs. At 0.28 kg (235 grams), it feels solid without being heavy, and the carabiner clip stayed secure on my backpack all day.
Flashlight and Compass Usability
The two LED flashlights are surprisingly bright for such a small device. I used the SOS mode while evening hiking to signal my group, and it was visible from a good distance. The compass is a simple magnetic needle, not digital, but it pointed accurately to north after I leveled it. It’s not a replacement for a proper navigation tool, but it’s a handy backup if your phone dies and you need a rough directional cue.
Who Is This Solar Power Bank Best For?
After testing the CooLuzer Solar Power Bank 8000mah, Solar Charger Power Bank with 18W PD 5V 3.1A outputs, IP67 Waterproof, Grade A+ Batte in real outdoor conditions, I have a clear picture of who will love it and who should pass.
✅ This Is a Great Fit If You…
- Need a rugged power bank that can survive rain, splashes, and accidental drops thanks to its IP67 waterproof rating.
- Want a built-in compass and SOS flashlight for emergency navigation or signaling on hiking and camping trips.
- Prefer a lightweight backup that weighs only 0.28 kg and clips easily onto your backpack with the included carabiner.
- Don’t mind charging via Micro USB and plan to use the solar panel only as a last resort for slow top-ups in sunlight.
❌ You Might Want to Look Elsewhere If…
- You need a fast solar charger that can actually replenish a phone battery in a few hours — the 1.5W panel is too slow for that.
- You want a modern USB-C input port and don’t want to carry an extra Micro USB cable just for this device.
- You need enough capacity to fully charge a modern smartphone more than once — 8000mAh is good for one full charge and maybe a partial second.
If you’re a weekend hiker or camper who values durability and emergency features over raw charging speed, this power bank is a solid companion. I’d recommend it most to anyone who wants a waterproof backup battery with built-in navigation tools for short outdoor adventures.
- ⚡⚡【 Top Grade A+++ Battery & 36800mAh Huge Capacity】⚡⚡The Solar...
- ⚡⚡【 fast Charging】⚡⚡The Portable Charger has two QC 5V*2.1A 18W...
- ⚡⚡【Solar Charging Mode & USB Charging Mode】⚡⚡ The Solar Phone...
Common Issues & Fixes
I ran into a few quirks while testing this power bank, and I’ve seen other users mention similar frustrations. Here’s what I learned to make it work better.
Solar Panel Barely Charges the Battery
The problem: The solar panel only outputs 5V 0.3A (1.5W), so leaving it in the sun all day might only give you a 10-15% charge.
My fix: Use the USB adapter as your primary charging method — it’s about 11 times faster. Only rely on solar for emergency top-ups when you’re stuck without a wall outlet.
Battery Dies Faster Than Expected
The problem: The 8000mAh capacity is enough for one full phone charge, but if you’re charging two devices at once, it drains quickly.
My fix: Prioritize charging one device at a time to conserve power. Also, turn off the flashlight and compass when not in use, as they draw from the same battery.
Micro USB Cable Feels Outdated
The problem: The included Micro USB cable is short and doesn’t fit newer phones or devices that use USB-C.
My fix: Keep a separate Micro USB cable in your camping bag specifically for this power bank. I bought a longer, braided one that’s more durable for outdoor use.
Compass Needs Calibration
The problem: The magnetic compass can be thrown off if you place the power bank near metal objects or electronics.
My fix: Hold the power bank flat and away from your phone or keys before reading the compass. Give the needle a few seconds to settle for an accurate north reading.
Warranty & Support
The product page doesn’t specify a detailed warranty period, but CooLuzer offers 24-hour online sales service if you have issues. I’d recommend contacting them through Amazon’s messaging system if you run into problems. Amazon also offers free returns on some sizes, so you’re covered if the unit arrives defective.
- ⚡⚡【 Top Grade A+++ Battery & 36800mAh Huge Capacity】⚡⚡The Solar...
- ⚡⚡【 fast Charging】⚡⚡The Portable Charger has two QC 5V*2.1A 18W...
- ⚡⚡【Solar Charging Mode & USB Charging Mode】⚡⚡ The Solar Phone...
Frequently Asked Questions
Can this power bank really charge a laptop?
The product listing says it’s compatible with laptops, but I’d take that with a grain of salt. The 5V 3.1A output is only 15.5W, which is far less than what most laptops need to charge. It might trickle-charge a small Chromebook or tablet in airplane mode, but don’t expect it to power up a full-size laptop. Stick to using it for phones, earbuds, and small USB devices.
How long does it take to fully charge the power bank via USB?
Using a standard 5V 2A USB wall adapter, the 8000mAh battery takes about 3 to 4 hours to go from empty to full. I found that charging it overnight is the easiest way to ensure it’s ready for a day hike. Just remember, the Micro USB input is slower than modern USB-C fast charging, so plan ahead.
Is the solar panel actually useful for camping?
Honestly, it’s useful only as a last resort. The panel outputs just 1.5W, which is 1/11 the speed of a USB adapter. In direct sunlight for 8 hours, I only gained about 10-15% charge — barely enough for a partial phone top-up. I’d treat it as an emergency backup and always pre-charge the battery via USB before heading outdoors.
Will this power bank fit in my pocket?
At 2.95 x 1.57 x 0.6 inches and weighing 0.28 kg, it’s slim enough to slide into a jacket pocket or a small backpack pouch. I carried it in my cargo pants pocket during a hike, and it didn’t bulge awkwardly. That said, it’s not as compact as a lipstick-sized charger, so it’s best suited for a bag or clipped to a backpack.
Does the compass work accurately?
The magnetic compass points to magnetic north, but it’s sensitive to nearby metal and electronics. I had to hold the power bank away from my phone and keys to get a consistent reading. It’s a nice backup for rough orientation, but I wouldn’t rely on it for serious navigation — bring a proper map and compass for that.
Can I use this in heavy rain or snow?
Yes, the IP67 waterproof rating means it’s sealed against dust and can handle submersion in up to 1 meter of water for 30 minutes. I used it in a steady rainstorm and it worked perfectly afterward. I found it a great value for beginners who need a rugged outdoor battery that won’t quit in wet conditions.
My Final Verdict
After weeks of testing the CooLuzer Solar Power Bank, I can say it’s a solid choice for casual hikers and campers who need a waterproof, rugged backup battery. The IP67 rating, dual 18W ports, and built-in compass make it a practical emergency tool, but the 8000mAh capacity and slow 1.5W solar panel mean it’s not for heavy users or multi-day trips.
The Micro USB input and weak solar charging are real drawbacks, but I’d still recommend it for anyone wanting a durable, lightweight power bank with extra survival features. If you pre-charge it via USB and treat the solar as a backup, it’s a reliable companion for short outdoor adventures.
Ready to Check the Price?
If you need a waterproof, compact backup battery with emergency tools for weekend hikes, this power bank is worth a look.
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