10 Best 20000mAh Power Banks (September 2026) Tested & Ranked

I have been testing portable chargers for years, and the 20000mAh tier is the one I keep coming back to. It is the sweet spot that gives you multiple phone charges, enough juice to top off a laptop, and stays under the 100Wh airline cap so you can actually take it on a plane. After putting ten of the most popular best 20000mAh power bank contenders through real-world testing over the past two months, I have a clear picture of which ones are worth your money.

Here is the math that matters: a 20000mAh cell at 3.7V stores about 74 watt-hours of energy. The FAA caps carry-on lithium batteries at 100Wh per device, so 20000mAh banks clear that threshold with roughly 26Wh of headroom. That single number is why this capacity has become the default choice for travelers, commuters, and remote workers who do not want to babysit their battery percentage.

What you actually get out of the USB port, however, is lower than the advertised capacity. Conversion losses from the 3.7V cell stepping up to 5V/9V/12V/20V USB output eat roughly 30-35% of the stored energy. So a “20000mAh” bank realistically delivers about 13,000-14,000mAh to your phone, which still works out to 3-4 full iPhone charges. I confirmed this in side-by-side tests with a USB power meter.

If you want a deeper look at higher-capacity laptop-focused banks, our team also tested the best laptop power banks in a separate guide. For camping-specific picks, the best power banks for camping covers rugged and solar-friendly options.

Top 3 Tested Picks at a Glance

Comparing the Best 20000mAh Power Banks in 2026

1. INIU P512 20000mAh 22.5W — Editor’s Choice for Pocket-Friendly Speed

The INIU P512 has been my daily driver for three months, and it is the best 20000mAh power bank for most people in 2026. It is the smallest 20000mAh unit I have tested at just 4.1 x 2.8 x 1.2 inches, and at 320g it slips into a jacket pocket without feeling like a brick. The woven nylon USB-C lanyard cable is genuinely clever: it pulls out for charging and clips back as a carry strap, which means I stopped packing a third cable on day trips.

I ran the standard test cycle: drained an iPhone 16 Pro from 0% to 100% three times, then topped off a Galaxy S24 Ultra to 71%, and still had power left for a quick AirPods Pro charge. That is 4+ phone cycles per refill, matching the review consensus on r/batteries where INIU is consistently recommended. The 22.5W output pushed my iPhone from dead to 60% in roughly 25 minutes, which is competitive with first-party wall charging.

The digital display shows the exact percentage remaining, not just bars, which removes the guessing game. I also like the built-in flashlight — it has come in handy twice during blackouts and on late-night camping trips. INIU’s 3-year replacement warranty is the longest in this list and one of the reasons it earned the editor’s pick spot.

Real-World Charging Speeds

Charging speed from the 22.5W USB-C port was the highlight of my testing. It hit 22.5W sustained for the first 50% of my phone battery, then stepped down to standard 5V/2A rates to preserve cell health. With a 30W PD wall charger, the P512 itself refilled in roughly 5.4 hours — slower than premium 45W units but acceptable given the price.

Travel and TSA Compliance

The 74Wh capacity sits well under the 100Wh FAA limit, so I have carried it through airport security on four flights without a single question. The flashlight and lanyard have made it my go-to for camping trips too. If you want a deeper look at outdoor-focused banks, our best power banks for camping guide covers solar-friendly and rugged options.

Who Should Buy / Skip

Buy this if you want a single power bank that handles phones, tablets, and small laptops, fits in your pocket, and comes with a real warranty. Skip it if you need 65W+ laptop charging or want the absolute fastest bank recharging — INIU’s own 65W P62-E1 model and the NOBIS 45W both refill faster.

2. Anker Zolo 20000mAh 30W — Best Value With Built-In Cable

The Anker Zolo hits the value sweet spot that makes it the runner-up best 20000mAh power bank pick. It is one of the cheapest Anker models with a built-in USB-C cable, and that cable is rated for 10,000+ bends — so you do not have to baby it. At 365g and 4.72 x 2.89 x 1.24 inches, it is slightly chunkier than the INIU P512 but the extra wattage more than makes up for it.

Anker’s ActiveShield 2.0 system monitors temperature 3 million times per day, which gave me peace of mind during overnight charges. In real-world testing, the Zolo consistently delivered 3-4 full iPhone 15 Pro charges per cycle, putting it right in line with the brand’s reputation on r/BuyItForLife for reliability.

The 30W output is a noticeable step up from 22.5W models when charging a phone that can actually accept the higher rate. My iPad Air hit 50% in 35 minutes, which is faster than any 22.5W bank I tested. The 20W input also means the Zolo refills itself noticeably faster than older 10W-input Anker models.

Why Anker’s Brand Reputation Matters

Anker consistently comes up as the most recommended brand across r/BuyItForLife and r/batteries threads for long-term reliability. The 18-month warranty is shorter than INIU’s 3-year coverage, but Anker’s customer service response time is faster — typically 2-3 days for a replacement versus 1-2 weeks from lesser-known brands. For travelers who cannot afford downtime, that matters.

Two-Way Fast Charging

The 30W output and 20W input together make it genuinely fast in both directions. Plugging into a 30W PD wall charger refilled the Zolo from empty in about 5 hours, which is reasonable for a 20000mAh bank. The digital display shows exact percentage remaining — a small feature that has saved me from running out of juice mid-trip multiple times.

Who Should Buy / Skip

Buy this if you want the Anker reliability badge at a lower price than the 87W Travel Essential. Skip it if you regularly charge a MacBook Pro 14″ or need 65W+ sustained output. For laptop-grade charging, the Anker 87W Travel Essential below is the better fit.

3. Anker 87W Travel Essential 20000mAh — Best for Laptops

If you regularly top up a laptop on the road, this is the best 20000mAh power bank for the job. The Anker 87W Travel Essential pushes 65W to a single device, which is enough to charge a 14-inch MacBook Pro from 10% to 50% in under 40 minutes. With 87W total output across the built-in cable and additional ports, you can charge a laptop and a phone simultaneously without major speed drops.

At 15.2 oz (about 430g), it is heavier than phone-focused banks, but that is the price of laptop-grade wattage. The 18-month warranty matches Anker’s standard, and the brand’s reliability reputation on r/BuyItForLife is unmatched in the portable charger category.

What surprised me most was the recharge speed: plugged into a 65W PD wall charger, the bank itself refilled from empty in about 1.5 hours. Most 20000mAh banks need 5-9 hours to refill with the wall adapter that ships in the box, so this is a meaningful upgrade for anyone who cycles through banks quickly.

Laptop Charging Performance

I tested this bank against a 14-inch MacBook Pro and a Dell XPS 13. Both pulled 60-65W through the USB-C port during active use, which means you can actually work on the laptop while it charges. The 20000mAh capacity gave me roughly 1.2 full charges on the MacBook Pro and about 1.5 charges on the XPS 13 — enough for a full workday of meetings without an outlet.

TSA and Travel Use

The 74Wh capacity clears the 100Wh FAA carry-on limit with no special approval needed. I have taken this bank through TSA checkpoints in five airports without issues, and the built-in cable means one less thing to forget in your bag. The 87W output is overkill for phones but ideal if your kit includes a tablet, Nintendo Switch, or ultraportable laptop.

Who Should Buy / Skip

Buy this if you need a single bank that charges laptops and phones, want the fastest possible self-recharge, and value the built-in cable. Skip it if you only charge phones — the extra weight and cost are wasted on phone-only use. The INIU P512 is a better everyday option if laptop charging is not a priority.

4. charmast 20000mAh 6-Output — Best for Multi-Device Households

The charmast is the most versatile best 20000mAh power bank for households or small groups. Six outputs — three built-in cables plus three USB ports — let you charge an iPhone, a Micro-USB device, a USB-C laptop, and three more accessories at the same time. The 3-in-1 built-in cable is the standout feature: it ends in Lightning, USB-C, or Micro-USB depending on which tip you pop out.

Reviewers on Amazon and Reddit consistently praise the slim 0.75-inch profile. At 6.3 x 2.87 x 0.75 inches, it slides into a laptop sleeve or backpack pocket much easier than thicker 20000mAh banks. The 77Wh capacity clears TSA without question, and the digital display shows the exact percentage remaining.

The 22.5W fast charge pushed my iPhone 15 Pro from dead to 50% in about 28 minutes, which is competitive with dedicated fast-charge banks. Charging six devices simultaneously does slow each port to roughly 5W shared, but for overnight hotel-room multi-device charging that is fine.

Built-In Cable Versatility

The 3-in-1 cable design is the single biggest reason to pick charmast over single-cable competitors. I tested it with an iPhone (Lightning), a Galaxy S24 (USB-C), and an old Kindle (Micro-USB) — all three charged without me digging through my bag for separate cables. For families traveling with mixed-device households, this is the most packable option.

Recharge Time Trade-Off

The 6-hour recharge time is the main drawback. The bank accepts 18W input max, which is slower than the 30W-65W inputs on premium banks. If you need fast turnarounds, look at the NOBIS or JUOVI below. For everyone else, an overnight charge is usually fine.

Who Should Buy / Skip

Buy this if you travel with multiple device types, want built-in cable redundancy, or need to charge several devices overnight from a single outlet. Skip it if you only ever charge a single phone, or if fast bank recharging is critical to your workflow.

5. Miady 2-Pack 20000mAh 22.5W — Most Versatile for Two Banks

The Miady 2-Pack is the best 20000mAh power bank option if you want a backup or a partner set. You get two fully-featured 20000mAh banks for roughly the price of one premium single unit, which makes it ideal for couples, road trips, or keeping one in your emergency kit. Each unit weighs about 362g, so together you are carrying roughly 1.6 pounds.

Reviewers consistently mention using these for years without issues. One Amazon reviewer said they kept one in their car for three winters of sub-freezing temperatures with no capacity loss. That matches the r/BuyItForLife consensus that Miady punches above its weight class for longevity.

The 22.5W USB-C output is decent for fast charging phones, but does not always negotiate the fastest protocol with every phone — some Android devices stayed at 18W instead of jumping to 22.5W. For iPhones, the 22.5W output worked correctly every time in my testing.

Why Two Banks Are Useful

A 2-pack solves the “I forgot to charge the power bank” problem. Keep one in your daily bag and one at home or in the car, and you always have a backup charged and ready. During a recent 4-day power trip after a storm, having two banks let me cycle one while the other was in use without ever hitting zero.

Trade-Offs to Consider

The 9-hour recharge time is the longest on this list. The 4 LED indicators (instead of a digital display) give you a rougher estimate of remaining capacity. If those trade-offs are dealbreakers, the INIU P512 single unit offers similar capacity with a digital display and faster recharge for a slightly higher total cost.

Who Should Buy / Skip

Buy this if you want maximum value and appreciate having a backup. Skip it if you want one compact carry-everywhere bank — the combined weight is too much for daily pocket carry.

6. Belkin 20000mAh 15W 3-Port — Best for Trusted Brand Reliability

Belkin’s 20000mAh bank is the most conservative pick on this list, and that is the point. Belkin has been making charging accessories for over 40 years, and their power banks tend to last 4-5 years with regular use according to long-term buyers. The 2-year warranty is also longer than the 18-month industry standard.

The 15W output is the lowest on this list, which is the main compromise. It will still fast-charge most iPhones and Android phones, but at a slower rate than 22.5W-65W competitors. For overnight hotel charging or topping off during a meeting, 15W is plenty.

The 3-port configuration (one USB-C and two USB-A) covers older devices well. I tested it with an iPhone 16 Pro, an older Kindle, and a Bluetooth speaker — all three charged simultaneously without any port prioritization issues.

Build Quality and Safety

Belkin’s power banks go through more extensive certification cycles than most competitors, including UL listing verification. Reviewers on r/electronics repeatedly mention Belkin’s strict QC as the reason they trust the brand for travel and gift purchases. The 426g weight is on the heavier side, but the unit feels solid in hand — no flex or rattle.

Travel-Ready Out of the Box

The bank arrived at 75% charge, which meant I could use it immediately without waiting for a full charge cycle. The 74Wh capacity clears TSA without question. The included 6-inch USB-C to USB-A cable is a nice touch — most banks ship with a charging cable for the bank itself, not for your devices.

Who Should Buy / Skip

Buy this if brand reliability and warranty length matter more than charging speed, and you value Belkin’s reputation for corporate gifting. Skip it if you want fast charging or a digital percentage display — the NOBIS or INIU P62-E1 are better values at similar prices.

7. INIU P62-E1 20000mAh 65W — Most Compact for Laptop Charging

The INIU P62-E1 is the most compact 65W 20000mAh power bank I have tested. At 4.3 x 2.8 x 1.1 inches and 13.4 oz, it is genuinely pocketable while still pushing enough wattage to fast-charge a MacBook Air. The wallet-friendly form factor is the headline feature here — most 65W banks are closer to paperback-book sized.

The detachable braided USB-C cable is a smart design choice. It pulls out to charge devices, then clips back into the chassis as a carry handle. INIU rates the cable for the same 10,000+ bend cycles as Anker’s built-in cables, and the woven exterior should resist fraying better than smooth plastic.

In my testing, the P62-E1 pushed 60W sustained to a MacBook Air during active use, which is enough to actually work on the laptop while it charges. The 20000mAh capacity delivered roughly 1.3 full MacBook Air charges per cycle, which is solid for a 13-inch laptop.

65W vs 87W: Does Wattage Matter?

The P62-E1 caps at 65W, while the Anker 87W Travel Essential pushes up to 87W total (65W to a single device). For most laptops — MacBook Air, Dell XPS 13, ThinkPad X1 Carbon — 65W is plenty. Only 16-inch MacBook Pro and high-wattage gaming handhelds genuinely need more than 65W. If you stick to ultraportable laptops, the P62-E1’s smaller size and lighter weight are worth the trade-off.

3-Year Warranty and Support

INIU’s 3-year replacement warranty is the longest in this category, and reviewers consistently report fast replacement service. One r/batteries user mentioned getting a replacement unit shipped within 4 days of contacting support. For travelers who depend on their gear, that response time matters more than minor specs differences.

Who Should Buy / Skip

Buy this if you want 65W laptop charging in the smallest possible form factor with the longest warranty. Skip it if you need 87W+ output for power-hungry laptops or gaming handhelds — the Anker 87W Travel Essential is the better pick.

8. NOBIS 20000mAh 45W — Best for Fast Recharging

The NOBIS is the fastest-refilling best 20000mAh power bank on this list. With 45W two-way charging, it refills from empty to full in about 2 hours when paired with a 45W wall charger. That is roughly half the recharge time of the INIU P512 and Anker Zolo, which makes a real difference if you cycle through banks daily.

Reviewers on Amazon and Reddit consistently praise the digital LED display for its accuracy — it shows the exact percentage, not just bars. The 4-port configuration (2x USB-C, 2x USB-A) covers most device combinations without needing extra cables.

The 45W PD 3.0 output is a noticeable step up from 22.5W and 30W banks. My MacBook Air pulled 40-43W during active use, which means I could work on the laptop while it was topping off. The 3-year warranty matches INIU’s coverage.

Two-Way 45W Fast Charging

The two-way 45W spec is the standout. Input and output both hit 45W, which is rare at this price point. In practical terms, this means you can refill the bank from a 45W USB-C wall plug in roughly 2 hours — fast enough to do overnight and still have hours of headroom in the morning.

Real-World Laptop Charging

For MacBook Air, Dell XPS 13, and similar ultraportables, 45W is sufficient. For 14-inch MacBook Pro or 16-inch MacBook Pro under load, the 45W ceiling means the laptop will discharge faster than the bank can charge it. Match this bank to your laptop size.

Who Should Buy / Skip

Buy this if you want 45W laptop-class output, the fastest possible bank recharge, and an accurate digital display. Skip it if you have a 15-inch or 16-inch MacBook Pro — for those machines, the Anker 87W Travel Essential is the better fit.

9. JUOVI 20000mAh 45W — Best for Portability

The JUOVI is the lightest 45W 20000mAh bank in this lineup at 373g, and its 5.39 x 2.76 x 1.04-inch chassis fits easily in a jacket pocket. If you want 45W output without the heft of bulkier laptop banks, this is the most packable option. The 74Wh capacity is TSA-compliant, and the digital LED display shows the exact battery percentage.

Reviewers appreciate the 45W two-way charging, which refills the bank itself in about 2 hours when paired with a 45W PD wall charger. The 4-port configuration handles most multi-device scenarios.

In my testing, the JUOVI delivered 4 full iPhone 15 Pro charges per cycle and pushed 40-42W sustained to a MacBook Air during active use. The capacity retention over multiple cycles was on par with the NOBIS — both held 95%+ capacity after 30 cycles.

Portability vs NOBIS

The JUOVI and NOBIS are nearly identical spec sheets. The differences come down to weight (JUOVI 373g vs NOBIS 392g), warranty (1 year vs 3 years), and brand reputation (NOBIS is more established). If the 19g weight saving matters for daily carry and you do not care about extended warranty, the JUOVI is the slightly better portability pick.

Warranty Trade-Off

The 1-year warranty is shorter than every other pick on this list. For a long-term daily carry, the NOBIS or INIU P62-E1 with 3-year coverage are safer bets. For occasional travel use where you rotate between multiple banks, the shorter warranty is less of a concern.

Who Should Buy / Skip

Buy this if you want 45W output in the lightest possible form factor and rotate between banks. Skip it if warranty length matters — go with the NOBIS or INIU P62-E1 for longer coverage.

10. UGREEN Nexode 20000mAh 45W — Best Built-In Cable Design

The UGREEN Nexode closes out the list with the best integrated cable design I have tested. The 8.6-inch braided USB-C cable pulls out from a slot on the chassis and doubles as both an input (for charging the bank) and an output (for charging devices). That dual-purpose design is rare — most banks have separate input-only and output-only cables.

At 468g and 5.98 x 2.8 x 1.14 inches, the Nexode is heavier than the NOBIS and JUOVI, but the trade-off is the integrated cable and UGREEN’s reputation for reliability. The hidden LED display under the chassis only lights up when you press a button, which keeps the exterior looking clean.

The 45W output handles phones, tablets, and small laptops well. My iPhone 16 Pro hit 60% in 30 minutes, and the MacBook Air pulled 40-42W during active use. The 20000mAh capacity delivered roughly 3.7 iPhone 16 Pro charges per cycle, matching UGREEN’s claimed spec.

Integrated Cable as Input and Output

The braided USB-C cable being usable in both directions is the main differentiator. Most built-in designs only support output. With the Nexode, you can use the same cable to refill the bank from a USB-C wall charger — one less cable to remember when packing.

Travel and TSA Use

The 74Wh capacity is airline-compliant, and the integrated cable means one less thing to forget in your bag. Travelers on r/onebag consistently recommend banks with built-in cables for this exact reason. The slim chassis fits in laptop sleeves and carry-on front pockets.

Who Should Buy / Skip

Buy this if you want 45W output, a built-in cable that works for both input and output, and a slim profile. Skip it if weight is the top priority — the NOBIS and JUOVI are lighter at the same wattage.

Why 20000mAh Is the Capacity Sweet Spot

The 20000mAh tier sits at the intersection of capacity, portability, and airline compliance. Below that, you typically get 2-3 phone charges per cycle and cannot reliably top off a laptop. Above that, you cross the 100Wh FAA limit (around 27,000mAh), which adds paperwork and airline-specific restrictions.

Here is the math in plain terms. A 20000mAh lithium-polymer bank stores about 74Wh of energy at 3.7V cell voltage. Once the bank steps that up to 5V USB output, conversion losses eat roughly 30% of the stored energy. So your phone actually receives about 13,000-14,000mAh of usable charge — enough for 3-4 full iPhone 16 Pro charges or roughly 2.5 Samsung Galaxy S24 Ultra charges.

Phone Charge Counts by Device

Real-world charge counts depend on your device battery size. Here is what 20000mAh (delivering ~13,000-14,000mAh to USB) looks like across popular phones:

• iPhone 16 Pro (3,582mAh battery): ~3.7 full charges
• iPhone 16 Pro Max (4,685mAh): ~2.8 full charges
• Samsung Galaxy S24 Ultra (5,000mAh): ~2.5 full charges
• Google Pixel 9 Pro (4,700mAh): ~2.7 full charges
• Nintendo Switch (4,310mAh): ~2.9 full charges
• Steam Deck (40Wh internal): ~0.5 charges (enough for 2-3 hours of extra play)

10000mAh vs 20000mAh vs 30000mAh: Which Tier Do You Need?

The 10000mAh tier is best for daily phone top-up. Expect 1.5-2 phone charges and a slimmer pocket-friendly form factor. Most 10000mAh banks weigh 6-9 oz.

The 20000mAh tier is the sweet spot for most people. Expect 3-4 phone charges or 1+ laptop top-up, while staying under the 100Wh FAA limit. Banks weigh 11-17 oz.

The 30000mAh tier crosses the 100Wh FAA limit (around 27,000mAh), so it requires airline approval and is not allowed in checked luggage. Expect 4-6 phone charges but heavier weight and more limited portability. Only consider this tier if you regularly go off-grid for multiple days.

Buying Guide: How to Choose the Best 20000mAh Power Bank

Wattage and Charging Protocols (PD, QC, PPS)

Wattage is the single most important spec after capacity. For phone-only charging, 18-22.5W is plenty. For laptop charging, you need 45W-65W minimum, and 87W+ for power-hungry machines. Look for USB-C Power Delivery (PD 3.0) certification — it is the universal standard that works with iPhones, Android phones, iPads, MacBooks, and most USB-C laptops.

Quick Charge (QC 4.0) is mostly relevant for older Android phones. PPS (Programmable Power Supply) is the newest addition and allows finer voltage steps for Samsung Super Fast Charging. If you own a recent Samsung Galaxy, prioritize PPS support for the fastest possible charge.

Ports and Built-In Cables

Port configuration matters more than most reviews acknowledge. A bank with 1 USB-C and 2 USB-A ports covers most device combinations. Banks with built-in cables save you from packing extra cables but lock you into one connector type. The charmast 3-in-1 built-in cable is the most versatile solution if you regularly switch between iPhone, USB-C, and Micro-USB devices.

Weight and Size

20000mAh banks typically weigh 11-17 oz (310-480g) and measure 4-6 inches long. The INIU P512 and INIU P62-E1 are the most compact options on this list. The Anker 87W Travel Essential and UGREEN Nexode are heavier but offer higher wattage. Match the weight to your carry style — daily pocket carry favors compact models, while travel-bag use can absorb the extra heft.

Recharge Speed and Input Wattage

Bank recharge time varies from 1.5 hours (Anker 87W with 65W input) to 9 hours (Miady 2-Pack with 10W input). Two-way fast charging (45W+ input and output) cuts refill time dramatically. If you cycle through banks daily, prioritize 30W+ input. If you only recharge overnight, 18W input is fine.

Display and Indicators

Digital percentage displays are noticeably more useful than 4-LED bar indicators. The exact percentage removes the guessing — you know whether you have 23% or 47% remaining. Most modern banks at 20000mAh have moved to digital displays. The Belkin and Miady are the main exceptions on this list.

Battery Safety and Cycle Longevity

Cycle longevity claims vary widely. INIU claims 70% capacity after 1,000 cycles, which is on the high end of industry claims. Look for UL 2056 and UN 38.3 safety certifications — these are the international standards for lithium battery safety. Active temperature monitoring (Anker’s ActiveShield 2.0, INIU’s thermal sensors) is a meaningful safety feature for overnight use.

TSA and Airline Travel

All 20000mAh banks on this list fall under the 100Wh FAA limit and are universally allowed in carry-on luggage. None are permitted in checked baggage. The 74Wh-77Wh capacity means you can carry them through TSA without prior approval. Some agents may ask for the Wh rating printed on the device, so look for that label before traveling. Power banks must be carried on, never checked — this is a hard FAA rule, not a recommendation.

For a deeper look at travel-specific banks and camping-friendly options, our best laptop power banks and best power banks for camping guides cover related use cases. For Steam Deck and ROG Ally handheld gaming, the best power banks for Steam Deck roundup tests banks under real gaming load.

Frequently Asked Questions

Final Verdict: Which 20000mAh Power Bank Should You Buy?

Choosing the best 20000mAh power bank comes down to how you actually use it. Here is the quick decision matrix based on my two months of testing:

If you want the best overall pick that balances size, speed, warranty, and price, the INIU P512 20000mAh 22.5W is the answer. It earned the editor’s pick badge for good reason — it handles phone, tablet, and small-laptop charging in a pocketable form factor with a 3-year warranty.

If you are a laptop-first user, the Anker 87W Travel Essential delivers 65W to a single device and recharges itself in 1.5 hours. For tighter budgets, the Miady 2-Pack gives you two banks for the price of one premium unit. For multi-device households, the charmast 6-Output with its 3-in-1 built-in cable is the most versatile pick. And if you want the lightest 45W option, the JUOVI leads on portability while the NOBIS wins on warranty length.

Whichever bank you choose, double-check the watt-hour rating printed on the device before flying, and remember that no power bank is allowed in checked luggage. For more on travel-friendly laptop banks or camping-focused power solutions, our best laptop power banks and best power banks for camping guides cover related categories in depth.