iPhones are great except for the fact that the company hasn’t made much effort to improve the quality of their batteries. The good thing, however, is that you can bridge this deficit by opting for either a replacement battery or battery case.
Replacement Battery vs. Battery Case
A replacement battery comes in handy when your OEM battery is totally inefficient. So, in that case, you’d need to remove the old battery and replace it with a new one.
Battery cases, on the other hand, are designed to complement the old batteries. So, you simply need to fit the case on your phone and leave it to supplement your battery needs.
Which one of the two options is the best? Well, as it turns out, there’s no a clear favorite. But in the next few lines, we’re going to talk about some awesome battery cases which provide a good value for money.
6 Best iPhone X Battery Case 2021 - Comparison Chart
We kick off this review by comparing the top 6 options by means of a chart. Hopefully, this will help you make an informed and solid choice.

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Best iPhone X Battery Case in 2021
1. Alpatronix BXX Battery Case and Wireless Charger
This powerful battery packs up over 4200mAh worth of power. In addition, it is UL-certificated which means that its internal system is perfectly designed with your safety in mind.
Moving on, the unit boasts a universal fast-charging unit which is compatible with all units that come with the BXX.
For now, the BXX is exclusively used for iPhone X and XS and other lately designed devices. Indeed, the included wireless charge goes a long way in helping you charge both your battery and the case together.
A closer look at it reveals that the system comes with two internal coils. Those coils allow you to recharge the system in different positions.
The icing on the cake is that this case is CE, RoHS, and FCC certificated. Also, the installation process is pretty straightforward.
Each unit comes with a 30-day money back guarantee. That said, we happen to wish that the system had a longer warranty window.
Otherwise, everything about this iPhone X battery case seems perfect.
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Cons
2. Pumier 4000mAh Battery Case
Who said you have to break the bank to get a great battery case for iPhone x? This product is a testament that it’s possible to get good quality without overspending.
The unit packs 4000mAh which is just as much as your phone needs to run for a whole day. On top of that, this replacement battery supports a lighting earphone.
That means you can listen to music and make calls, easily. On top of that, the unit boasts an embedded metal plate which comes in handy in supporting a car mount.
The case is designed such that it’s easy to use especially for car owners. Best of all, it comes with a 30-day money back guarantee period.
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Cons
Also read: Best Nexus 6 Case Reviews & 20 Accessories for the Samsung Galaxy S5
3. Red 5200mAh Battery Case for iPhone X/XS
This case is known for being ultra slim and sleek. That’s beside it coming with a highly effective wireless connectivity to headphone accessories.
The unit further comes with a highly effective power button. The button works conveniently for switching the unit on and off.
The unit packs 5200mAh worth of power. That’s probably because of its Li-polymer rechargeable design.
In other words, on a full charge, this case can provide you with a talk time of 17 hours onward. On top of that, the case can provide you with at least 12 hours of browsing time.
For those of us who like listening to music, this case can provide you with up to 60 hours of run-time. However, when used for gaming, the unit can drop its power efficiency to as few as 3 hours.
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4. Pumier iPhone X/XS Slim Pack Case
Even though some cases are great, they have issues with scratching, peeling, and fingerprints. But this one from Pumier is different!
In fact, it’s designed with an internal sensor who detects your iPhone’s temperature. If your iPhone overheats, this case will automatically stop charging – as a safety measure.
The unit, however, offers you a built-in capacity of 300mAh. We’d have wished for a bit more power.
Otherwise, this is just enough to run you for about 10 hours on average. Not bad especially if you’re shopping for a backup solution.
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5. Pumier QI Battery Case 4500mAh
This is yet another awesome replacement battery from Pumier. A closer look at it reveals that it packs a bit more power.
In fact, at 4500mAh, this unit provides about 12 hours of talk time, 8 hours of browsing and about 45 minutes of listening to MP3 music.
It may not be the most powerful battery on the pack yet but we believe it represents a great value for money. It’s, therefore, worth taking a closer look at.
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6. Ainope iPhone X 6000mAh Portable Battery Case
This is the most powerful battery case for iPhone X reviewed so far. As you can see, it provides you with a 6000mAh power capacity.
That’s more than you need to listen to MP3 songs for over 60 hours. On top of that, you can bank on it to keep you browsing for at least 12 hours.
On top of that, this sleek case offers a great standby time.
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The Buying Guide
So, to decide which iPhone X battery case works best, we’d recommended using the following buying tips.
Tip 1: Check to see if it comes with a battery level indicator
Tip 2: Go for a unit with at least 3500mAh power
Tip 3: Your replacement case should be well made and durable
Tip 4: It should be reasonably priced
Tip 5: It’s a good idea to go for something that has a money-back guarantee
Which One Is The Best?
One battery case stood out for us. That is the Red 5200mAh Battery Case for iPhone X/XS. It’s sleek, classy, and powerful. It also has a great customer support.
Final Thoughts
Now that you have a clue what the best iPhone X battery case is, you have the power to make an informed choice. Hopefully, you’ll be able to get the best value for your money, while at it.