Best Phone Batteries for iPhone 8 of 2025

"I found the battery life doubled after installation. Installation was a bit tedious with tiny screws, but overall, I'm happy with the result. It’s an inexpensive way to revive my old phone."

"Replacing the battery on my daughter's iPhone 8 was challenging. I had to heat the edges to soften the glue, and using the provided tools was tricky. The magnetized screwdriver was very useful, but I recommend removing old glue before reattaching the screen."

"Initially, I was not satisfied because I received a different battery than expected. However, after a few days, the battery performance improved significantly, lasting two to three days of normal use. I'm now quite pleased!"

"I found the installation process straightforward. Having replaced my iPhone 8 battery a few times, I was able to do it again with ease. The battery life has been great and I feel like I extended the phone's life significantly."

"I was pleasantly surprised by the value of this battery kit. I got two batteries and a charger for just $17. Following the manufacturer's break-in instructions, I noticed that one battery lasts about 4 hours for my portable speaker. I plan to keep using the second battery while the first charges."

"The instructions were decent, and I found videos online that helped. However, I wish the installation guide had been more detailed, especially regarding the adhesive residue. Overall, it's a solid battery, and my iPhone 8 feels revitalized."

"I found the installation very straightforward. The battery holds a good charge, and I appreciated the cardboard screw placement."

"After replacing the battery, my phone's battery life improved from 68% to 100%! I'm really happy with this purchase."

"I previously ordered from another vendor and was disappointed, but this product is way better quality. I'm definitely buying all my batteries from this vendor now."

"I bought this to resolve my battery issues with my old iPhone. I installed it, charged the phone, but unfortunately, it was dead within 24 hours. I'm not sure if I received a faulty battery."

"Although I find fixing tech challenging, I didn't want to pay full price. My husband, who can fix things, managed to install this battery despite the included tools not being great. Now, my iPhone holds battery life well and it saved me a lot compared to local shop prices!"

"I found a very helpful video on YouTube that guided me through replacing my battery step-by-step. After replacing it, I charged the battery to 100% and then played music at full volume for over 4 hours—the battery only dropped to 62%! I’m quite pleased with my decision to go with this battery. The tool kit provided was great as well. However, one thing to note: I had to pry the battery out using one of the tools since the adhesive strips didn't come out easily like in the video."

"This was my first attempt at changing a battery, and I'm glad I did it myself. I watched a YouTube video beforehand, which helped immensely. It took some patience and time, but I saved around $100 by doing it myself!"

"I had to give this battery a second chance before returning it. I made sure the power connector was firmly inserted and tried again from scratch. It finally started to charge, but I'm still unsure if it will continue working. Initially, both the first battery and the replacement did not hold a charge and kept cycling the Apple logo. I ended up feeling quite frustrated with this product."

"I found the XYIRMCYF 13500mAh Super Capacity Battery for my iPhone Xs MAX to be a game-changer! It outperforms the original battery, allowing me to use my phone all day without worrying about charging."

"After replacing batteries for family members, I decided to try the XYIRMCYF batteries for my phones. I was pleasantly surprised; they fit perfectly and provide long-lasting power—4+ days on standby!"

"I installed the battery in my S8, but it didn't charge properly. I tried a second one, and it had the same issue. While I appreciate the tools provided, I wouldn't recommend the Galaxy S8 batteries."

"I decided to try this iFixit battery after mixed results with cheaper options. Following their recommended battery calibration, I was surprised at how well it performed. The instruction video was a bit short and suggested using an iOpener, which wasn’t included in the toolkit. I found that a microwaveable heating pad worked just as well. The tools provided weren't quite fine enough to get under the screen, so I had to use a different tool, aware that it might crack the screen. Patience is key, and you can do it too!"

"Replacing my old iPhone 8 battery was challenging but rewarding. I really appreciated that this battery came with all the necessary tools and a new waterproofing seal. I heated the phone with a hair dryer before opening it, which was essential due to the strong seal. The tiny screws were tricky, and I ended up stripping one, but luckily had an eyeglass screwdriver handy. After a careful process, the new battery shows 100% health, which is a significant improvement from my previous battery that was draining so quickly."

"I've been using this battery for two days now, and it’s working perfectly! After a full charge, it only drops to 50% in 17 hours with moderate usage, which I find acceptable. It matches the capacity of the original battery, and I feel confident in its performance. I suspect that batteries claiming much higher capacity might risk damaging the phone, so I’m pleased with my choice."

"I experienced great battery life with this replacement. It lasts me over a day now!"

"I found this battery to be a perfect fit for my phone. Installation was quick and easy, highly recommend!"

"After purchasing this battery for my iPhone XR, I am thrilled with the results! Incredible autonomy – my phone lasts two days even with heavy use. Easy installation with the included kit, and the quality is excellent. Competitive price too! If you're looking for a replacement battery for your iPhone XR, this is the one!"

"I have ordered batteries multiple times, and I'm very happy with their performance. They do get hot occasionally, but that's expected. I’m pleased enough to keep buying them, and I rate them a 10 out of 10."

"After using it for a while, I can say this battery holds a charge really well on standby. I mainly use my phone as a camera, and the battery health monitor shows it's working at 100%. It discharges slower than my old phone battery, which is a plus."

"I bought this battery to replace my old one, and while it initially seemed to drain quickly, after several cycles, it now holds a charge much better. It has definitely improved, and I'm glad I replaced my bulging battery with this one. Worth the cost!"

"I’m thrilled to have discovered this battery for my grandma's phone! She was reluctant to upgrade, but the battery life had really deteriorated, making it hard to find a replacement. This upgraded 5500mAh battery fits perfectly, giving her significantly longer battery life. Now, she can use her phone worry-free throughout the day. I highly recommend this battery for anyone facing a similar issue!"

"I wanted a battery that would last at least 16 hours. This one claims to be three times as powerful as the standard 4000mAh Apple-approved batteries. Unfortunately, I was told by several shops that it wasn't Apple-approved and wouldn't install it. After finding a shop that would, I received a warning in Settings about the battery not being recognized. My old battery lasted about 8 hours, but this new one hasn't improved anything. I'd consider just upgrading my phone instead of dealing with this."

"I bought this for my old iPhone 7, but it turned out to be too powerful for my phone. After a professional installation, the tech was amazed at how much power they packed in such a small form. The quality was excellent, but my phone got unusually hot. I had to replace it with a standard battery instead. I didn’t return it because it’s a great product, just not suitable for my needs."

"After a nightmare with my first battery, I tried this one, and I'm so glad I did. Installation was a breeze, it came with everything I needed, and it works perfectly. This replacement has truly restored my phone and my faith in handling things on my own."

"I found the installation to be a bit challenging, as I would rate my skill level needed for this task as proficient/advanced. It took me over an hour, and while the included instructions were helpful, I had to rely heavily on a YouTube tutorial. The hardest part was definitely opening the phone and getting the old battery out."

"Overall, I was pleased with the battery's initial performance, though I was disappointed when it died just six months after installation. The installation was fairly straightforward, but I had hoped for a longer lifespan."