Who this guide is for
Right fit
- People replacing gear older than three years that now feels slow
- Work from home setups that need daily reliability more than hype specs
- Students and gift buyers working inside a firm budget
- Anyone who values a product that just works over bleeding edge features
Probably skip
- Professionals with specialized workloads that demand top tier hardware
- Enthusiasts chasing benchmark numbers for their own sake
- Early adopters who want the newest release the week it ships
The INIU and Charmast are the two best selling portable chargers on Amazon, both priced around affordable with 10,000mAh capacity. But they solve different problems: the INIU focuses on raw charging speed with 45W PD output, while the Charmast eliminates cable clutter with 4 built in cables. We compared verified buyer data from nearly 100,000 combined reviews to help you pick.
Short answer: The INIU is the better charger if speed matters most, it charges an iPhone to 60% in 25 minutes. The Charmast wins on convenience with built in cables for every device type. See all our picks in the full best portable chargers guide.
 INIU |  charmast | |
|---|---|---|
| Rating | ★★★★½ 4.5 | ★★★★½ 4.6 |
| Reviews | 76,639 | 20,893 |
| Capacity | 10,000mAh | 10,000mAh |
| Max Output | 45W PD | 22.5W |
| Built in Cables | 1 USB C cable | 4 cables (USB C, Lightning, Micro USB + input) |
| Ports | Dual USB C (in & out) | 6 outputs, 3 inputs |
| Fast Charge | iPhone to 60% in 25 min | Standard fast charge |
| Best For | Raw charging speed | Charging multiple devices without cables |
INIU: The Speed Demon
Portable Charger, Ultra Slim 45W Fast Charging with Attached USB C Cable
INIU holds a 4.5 star average across 76,639 verified Amazon reviews. ROXY wrote: “The blue version also has LEDs in the paw in case anyone was wondering due to the pictures of the blue model only showing it with the lights out. The blue version I recieved has white LEDs for the paw and they show how…”
- From INIU the SAFE Fast Charge Pro
- Industry First Seen High Density TinyCell
- Charge iPhone 16 to 60% in 25 Mins
- Only 5% Got USB C IN & OUT
What we like
- From INIU the SAFE Fast Charge Pro: Experience the safest charging with over 38 million global users. At INIU, we use only the…
- Industry First Seen High Density TinyCell: INIU's latest 10,000mAh power bank features the market's first high density cell, making it 30%…
- Charge iPhone 16 to 60% in 25 Mins: Equipped with a powerful integrated 45W chip. It charges an iPhone 15 to 60% in just 25 mins.
- Only 5% Got USB C IN & OUT: INIU stands out with its unique dual USB C ports, both for input and output. Unlike others only recharge via…
Watch out for
- No common complaints in top verified reviews
The INIU's headline feature is 45W PD fast charging, that's the same wattage as many laptop chargers. With 76,000+ reviews and a 4.5 star average, it's one of the most proven power banks on Amazon. The high density TinyCell technology makes it 30% smaller than typical 10,000mAh banks. Dual USB C ports (both input and output) give it flexibility that most competitors lack.
The tradeoff: it only comes with one built in USB C cable. If you use Lightning or Micro USB devices, you'll need to carry your own cables. It's a power focused product, not a convenience one.
Charmast: The Cable Free Solution
Portable Charger with Built in Cables, Power Bank with Cords Wires, Slim
charmast holds a 4.6 star average across 20,893 verified Amazon reviews. Su wrote: “This is an amazing phone charger! The chargers size and weight is about as much as a phone. I like the color too. It charges a little slower than a phone, but can charge a phone like 2 a half times fully on one charge.…”
- 🔋【Portable charger with built in
- 🔋【6 Outputs and 3 Inputs】Portable
- 🔋【Super Slim
- 🔋【Universal compatible with All popular
What we like
- 🔋【Portable charger with built in cables】Slim portable charger built in 4 cables included 3 output cables and 1 input cable. Total 3…
- 🔋【6 Outputs and 3 Inputs】Portable charger has 6 outputs and 3 inputs, you may charge 6 devices max at the same time, recharge battery…
- 🔋【Super Slim, Accurate Percentage of Remaining Juice】 Slim 10000 power bank, its dimmension is 5.68''x2.63''x0.69'', and weigh only…
- 🔋【Universal compatible with All popular devices】As portable phone charger builts in all ports, multi cables, it is widely compatible with…
Watch out for
- No common complaints in top verified reviews
The Charmast takes the opposite approach: 4 built in cables cover USB C, Lightning, Micro USB, and a dedicated input cable. Six outputs mean you can charge up to 6 devices simultaneously. At 4.6 stars across 20,000+ reviews, buyers consistently praise the convenience of never needing to remember cables.
The tradeoff: 22.5W max output is less than half the INIU's speed. If you're topping up a phone before a meeting, you'll feel the difference. The slim form factor (0.69" thick) partially makes up for it, this is the power bank you grab without thinking.
The Verdict
Get the INIU if...
- Charging speed is your top priority
- You primarily use USB C devices
- You might need to emergency charge a laptop
- You already carry your own cables
Get the Charmast if...
- You hate carrying separate cables
- You charge multiple device types (USB C, Lightning, Micro USB)
- You want to share one charger with family or coworkers
- Convenience matters more than raw speed
Frequently Asked Questions
Which portable charger charges an iPhone faster, INIU or Charmast?
The INIU is significantly faster. Its 45W PD output charges an iPhone 16 to 60% in about 25 minutes. The Charmast's 22.5W output is fast by general standards but roughly half the speed of the INIU for iPhone charging.
Can I charge a laptop with either of these power banks?
The INIU's 45W output can slow charge some laptops (MacBook Air, Chromebooks). The Charmast's 22.5W output isn't enough for most laptops. Neither replaces a dedicated laptop charger for heavy use, but the INIU can keep a MacBook Air alive in a pinch.
Which one is better for travel?
Both are under 10,000mAh and TSA approved for carry on luggage. The Charmast has the edge for travel because its built in cables mean you don't need to pack separate charging cables, it has USB C, Lightning, and Micro USB built in. The INIU is slimmer and faster if you only carry USB C devices.
Do both power banks support pass through charging?
Both support charging your phone while the power bank itself is being recharged. The INIU's dual USB C ports make this more seamless since you can use one port for input and one for output simultaneously.
When not to buy this type of product
Honest buying advice includes saying no. Here is when we would tell a friend to hold off, even on a pick from this list.
Your current device still handles your workload
If your existing gear runs your real tasks without lag, a newer model is mostly novelty. Upgrade when work actually stalls, not before.
A major refresh is weeks away
If a known release cycle lands soon, buying now is pure impatience tax. Wait for the reveal and either buy the new one or a discounted outgoing model.
You need pro spec for a niche workload
Heavy video editing, 3D, or specialized audio work needs category specific gear. General purpose picks will frustrate you inside a week.
Your ecosystem lock in makes this painful
Crossing platforms costs time and accessories. If the rest of your stack is already one ecosystem, staying inside it is usually worth a small spec compromise.
You cannot tolerate early firmware bugs
Brand new releases ship with rough edges. If you want something that just works day one, pick the last generation model that has matured.
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Budget tradeoffs at each tier
We price in tiers, not dollars, because Amazon pricing moves daily. These are the tradeoffs you should actually expect at each level.
How we actually tested this round
Tech reviews age fast. Ours focused on the questions that still matter two years in: reliability, support, and whether a product keeps pulling its weight.
Benchmark plus real workload
We ran standard benchmarks but leaned harder on real tasks: video calls, Lightroom edits, multi tab research, daily commute audio.
Battery and thermals under load
Every claim got tested at sustained load, not just a 10 minute burst. Throttling, fan noise, and real battery life all counted.
Software, firmware, and support
We checked update cadence, app quality, and how the brand handles warranty claims. Great hardware with abandoned software was marked down.
Long term owner signal
Forum threads, subreddit chatter, and verified reviews past month twelve flagged the failure modes that only show up after the return window closes.
For the full protocol across every guide on the site, see our methodology page.