Top 5 Best Replacement Battery or Battery Case for iPhone 8 – 2023 Updated List

Is your iPhone 8 slowing down but it’s still in good shape? Well, it might be time to replace its battery to boost its performance rather than buying a new one. You can also choose to use a battery case to add additional battery life to it.

In this article, we take a look at some of the best iPhone 8 replacement batteries and battery cases including their:

  • Features and benefits
  • Pros and cons
  • Buying guide
Best Replacement Battery or Battery Case for iPhone 8

Replacement Battery for iPhone 8 – Comparison

Here is a list of some of the best options on the market together with an incredible buying guide. We hope this comparison chart provides you with a better idea of what to expect from each product.

RankingProduct NameCapacityBatteries
1HDCKU Battery Replacement Kit2691mAh1 Lithium ion batteries required. (included)
2Elze Ultra-slim 2600mAh
3Yacikos 8500mAh Portable
480sBrothers 5000mAh Portable
5iBatrycas 4000mAh Rechargeable Battery Charger Case

1. HDCKU Battery Replacement Kit

Designed for iPhone 8 plus, this battery from HDCKU boasts premium A+ battery cells that deliver up to 2691mAh capacity. On top of that, it is made to last up to 500 charging cycles.

Similar to most replacement batteries for iPhones, this kit features an inbuilt microchip. The microchip works by monitoring both the input and temperature of the battery. As a result, issues like over-heating, overcharging, and over-discharging should not worry you.

As if that’s not enough, each battery is pre-tested under very strict quality control and guaranteed to work as expected. On top of that, it is RoHS and CE certified to ensure optimal safety.


  • Backed by 365-days manufacturers’ warranty
  • Includes all the necessary tools for replacing the battery
  • 24-hour customer service support
  • Premium build quality


  • Drains quickly at the beginning but gets better with time

2. Elze Ultra-slim 2600mAh Battery Case

Featuring a built-in Li-polymer battery, the case provides you with up to two times more power than the original battery. For instance, you can enjoy 43 hours of extra music time, 8.5 hours of web browsing, and 5 hours of 3D gaming.

Weighing just 0.33lb and with a thickness of 0.22 inches, the case spots an ultra-slim and lightweight design. Therefore, portability should not be an issue making it perfect for your daily life.

Additionally, the case employs internal chips to minimize issues like short-circuiting, discharging, overheating, and overcharging. For long-lasting performance, it is constructed from industrial-grade materials.

What’s more? The Elze 2600mAh Battery Case is fitted with 4 LED lights that indicate the charging status of the case.


  • You can charge case and phone simultaneously
  • 18-months warranty
  • Durable performance
  • CE, RoHS, FCC, and PSE certified for safety


  • Does not offer screen protection

Also read: Top 7 Best iPhone 6 Replacement Battery Options

3. Yacikos 8500mAh Portable Battery Case

If you’re looking for a battery case with a huge capacity for your iPhone 8 plus and iphone X, this model is an excellent choice. The case boasts 8500mAh capacity which is enough to let you enjoy 60-hours of audio playback and 17-hours talk time.

In terms of construction, the case is crafted from high-grade silicone material coupled with a protective 360-degree silicone pad. What is more, it comes accompanied by RoHS, CE, and FFC certification. Therefore, both the safety and durability of the case is guaranteed.

In addition to that, it features a lightweight and ultra-slim design making it convenient to carry around in your pocket.

And you know what the best part is? The case is outfitted with four LED indicator lights to let you know of its power status. This enables you to recharge it only when it runs out of charge completely.


  • Easy to install and use
  • Ultra-high capacity
  • 100% satisfaction guarantee
  • Two-year warranty


  • Slightly hard to remove the phone from the case

4. 80sBrothers 5000mAh Portable Rechargeable Case

Crafted from soft TPU and premium-quality PE, the case is robust enough to protect your phone from daily wear and tear. Besides, it incorporates safeguard system for safe, high-speed and reliable charging.

As if that’s not enough, the case is backed by a lifetime warranty plus a 30-day money back guarantee. So, if you’re not satisfied with the purchase, you can return the product and get a refund.

Similar to other battery cases, it also comes with LED indicator to show you the charging status of the case. Moreover, the case spots a portable design making it an ideal choice for travelers and heavy users.


  • High capacity for extra battery life
  • Quick installation and removal
  • Offers 360-degree phone protection 
  • Compatible with iPhone 7, 6s, 6, and 8


  • Makes the phone slightly bulkier

5. iBatrycas 4000mAh Rechargeable Battery Charger Case

With a powerful 4000mAh capacity, this battery case will provide your iPhone 8 plus with a 100% battery lift. Best of all, it allows you to charge your iPhone and the case simultaneously using your Apple cable.

Apart from charging your phone, the case also offers complete protection to your phone against scrapes, serious drops, and scratches.

Besides, it employs a soft outer TPU layer that offers an ergonomic grip to prevent your phone from slipping from the hands.

Additionally, it is outfitted with an internal smart chip to protect your phone from overheating, overcharging, and short-circuiting. Also included is an LED indicator that indicates how much power the case has.


  • Tough and rugged design
  • One year warranty and 30-day refund policy
  • Tempered glass for screen protection
  • Slim and portable design


  • Tempered glass does not offer edge-to-edge protection

Replacement Battery for iPhone 8 – Buying Guide

If you want to get value for your money, finding the best iPhone 8 replacement batteries or battery case is important. So, here are some things to keep in mind:

  • The battery and case should have an internal chip for safety and protection
  • Replacement battery and case need to have a capacity of at least 2000mAh
  • The battery case should be constructed from robust materials like TPU or silicone
  • Both battery and case must be accompanied by at least a one year warranty

Which is best for you?

Overall, the Yacikos 8500mAh Portable Battery Case stands out as the best option. Its ultra-high capacity is one of the reasons we feel it offers better value for money than the rest.

In addition, we love the fact that it comes with a two-year warranty and offers optimal protection to your phone.


Whether you choose to invest in a replacement battery or a battery case, the above options are a great buy. Hopefully, you find one that best suits your needs. You really don’t need to put up with your iPhone 8 slow performance anymore.

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