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What are criterias of the best iphone battery case 8 slim? It is not easy to find the answer. We spent many hours to analyst top 10 iphone battery case 8 slim and find the best one for you. Let’s find more detail below.

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Best iphone battery case 8 slim reviews

1. Battery Case for iPhone 6s Plus/6 Plus/7 Plus/8 Plus 8500mAh, Rechargeable Charging Case for iPhone 6Plus Extended Battery Pack Charger Apple 6s Plus Portable Power Bank Cover for 7Plus 8Plus (5.5)

Feature

LONG BATTERY LIFE iPhone 6sPlus/6Plus/7Plus/8Plus battery case 8500mah provides extra 17 hours talktime, 60 hours music time and 13 hours video time, only fits well for iPhone 6sPlus/6Plus/7Plus/8Plus(5.5 inch)NOT works on iPhone 6/6s/7/8.
SYNC&CHARGING iPhone 6sPlus/6Plus/7Plus/8Plus battery pack supports syncing data to Macbook, PC or laptop and charging your phone simultaneously without removing it;Just slide your phone into the battery cases, press the ON button for 3 seconds on the back bottom of the charging case to charge your iPhone 6sPlus/6Plus/7Plus/8Plus.
360 PROTECTION The iPhone 6s+/ 6+/ 7+/ 8+ battery cover is not only a portable charging case, but also a 360 protective case for cellphone from scratches and other daily wear and tear.(Not include phone screen) Internal high quality chips also protect your iPhone 6sPlus/6Plus/7Plus/8Plus from overheating, short-circuiting and over charging.
PLEASE NOTES For iPhone 6sPlus/6Plus, Compatible with traditional 3.5mm lighting headphones or wireless Bluetooth headphones to listen to music. For iPhone 7Plus/8Plus, ONLY works with Apple Airpods or other wireless Bluetooth headphone. Not compatible with iPhone lightning headphone or traditional 3.5mm headphones. This iPhone 6sPlus/6Plus/7Plus/8Plus battery case 8500mah is ONLY for iPhone 6sPlus/6Plus/7Plus/8Plus phone, Not works on iPhone 6s/6/7/8 phone.
WHAT YOU GET 1 x iPhone 6sPlus/6Plus/7Plus/8Plus Battery Case 8500mAh , 1 x User Manual. Also you will receive 12 months after-sale service and 30-days hassle-free return service. Please feel free to contact us first if you have any product problem.

2. Mophie Juice Pack Wireless - compatible with iPhone 7 & 8 and iPhone SE - Charge Force Wireless Power - Wireless Charging Protective Battery Pack Case, Black (Packaging may vary)

Feature

Included components: Mophie juice pack; Micro Usb cable; Quick start guide. Low profile with high-impact protection - Wireless power and extra battery in a light-weight form factor with rubberized support pads on the interior, built to withstand drops and hard falls, complete with raised corners for added protection against scratched and cracked screens.

3. QTshine Battery Case for iPhone 6/6s/7/8, Upgraded [6000mAh] Protective Portable Charging Case Rechargeable Extended Battery Pack for Apple iPhone 6/6s/7/8 (4.7') - Black

Feature

Compatible ModelPlease note this battery charging case is only fit for iphone 6/6s/7/8 (4.7 inch), Not fit for iPhone 6plus/6s plus/7plus/8plus(5.5 inch) or other models; Not compatible with iPhone lightning headphone or traditional 3.5mm headphones, ONLY works with Apple airpods or other wireless Bluetooth headphone.
6000mAh High Capacity Last LongerEquipped with a powerful 6000mAh built-in lithium polymer battery chip, more than doubles your iPhone's battery life and never worried about your iPhone ran out of battery in daily life. it's portable charging anytime and anywhere. perfect for traveling, camping, business trip or other outdoor occasions.
Safe Charging and Protective DesignQTshine battery case for iPhone 6/6s/7/8 was charging and protecting double function, well-made hard case with 360 degree protective bumper design, protect your iPhone from scratches or other daily wear and tear. certificated by CE, FC and RoHS. high-quality polymer batteries and safe circuit diagram design, internal chips to protect your smart phone from overheating, short-circuiting, over charging, and discharging.
Advanced Sync & Convenient LED IndicatorAmazing sync-through technology that you can simultaneously charge your iPhone and the iPhone iphone 6/6s/7/8 battery charger case together. Conveniently sync your iPhone to your Macbook, PC or laptop without having to take the battery case off. 4 LED battery level indicators that let you know how much power you have (0--25%--50%--75%--100%). Besides, you can switch on/off the iPhone battery case.
Risk Free & 24 Month after-Sale Technical SupportCustomer satisfaction is our primary priority. if you have any questions, issues or concerns please email to our after-sale team and we would be more than happy to assist. 24 Month after-Sale Technical Support, 30days no-hassle return and 24H customer service.

4. Battery Case for iPhone 6s Plus/6 Plus/7 Plus/8 Plus,8500mAh Portable Charging Case External Battery Pack for iPhone 6s Plus/6 Plus/7 Plus/8 Plus Rechargeable Charger Case Backup Power Bank(5.5 inch)

Feature

[ IMPORTANT NOTE ]:This battery case ONLY fit for iPhone 6s Plus/6 Plus/7 Plus/8 Plus (5.5inch),NOT works on iPhone 6/7/8(4.7inch)For iPhone 6s Plus/6 Plus, Compatible with traditional 3.5mm lighting headphones or wireless Bluetooth headphones to listen to music. For iPhone 7 Plus/8 Plus, ONLY works with Apple Airpods or other wireless Bluetooth headphone,Not compatible with iPhone lightning headphone or traditional 3.5mm headphones.
[ LONG CHARGING LIFE]:This rechargeable powerful high capacity 8500mAh iPhone 6s Plus/6 Plus/7 Plus/8 Plus Li-polymer backup charging case can effectively provide 200% +extra battery life for your phone,up to 17 hours Talk time, 12 hours on web browsing time ,60 hours listen music ,13 hours video,3 hours 3D playing games.
[ADVANCED SYNC-THROUGH TECHNOLOGY ]: You can sync your iPhone 6s Plus/6 Plus/7 Plus/8 Plus to your Mac book,PC or laptop without take off the battery cover.also 100% compatible with all iOS versions and future iOS software updates,not compatible with Apple CarPlay.
[ 360 PROTECTING AND CHARGING 2 IN 1 ]: Built in internal high quality chips can prevents your phone battery short-circuiting, overheating and over-charging. 360 full bumper design and hard shell back to protect your phone from scratches and other daily wear and tear(Not include phone screen).
[ PERFECT SERVICES ]: We always strive to offer the best customer service, If you are not 100% satisfied with the battery case, please feel free to contact us. We will solve your problem within 24 hours,we will give you a satisfactory solution!

5. Wixann Battery Case for iPhone 6/6s/7/8/SE 2020 Upgraded 3000mAh Slim Portable Charging Case Rechargeable Extended Charger Case for Apple iPhone 6/6s/7/8/SE 2020

Feature

For iPhone 6/6s/7/8 ONLYThe 3000mah battery case is only for iPhone 8/7 /6s/6 (4.7 inch), but not for iPhone 8 Plus /7 Plus /6s Plus/6 Plus(5.5 inch). Put the phone into the battery case first, and then press the power button on the back for 3s to start charging. The LED indicator will keep showing the remaining battery.
Add 100% EXTRA BATTERY LIFEThe Charger Case for iphone 8/7/6/6s perfectly solve the problem of phone's low battery or exhausted power, and it will be your iPhone's best power companion. There inside sets built-in high-quality 3000mah lithium polymer battery to extend your iPhone's 100% service life. Besides, it is equipped with advanced chips to protect your iPhone from overheating, short-circuiting and overcharging.
CHARGE, LISTEN, ENJOYWhen connecting the mobile phone to the charging case with original Apple iPhone data cable, it and will intelligently charge the mobile phone first. You can also sync your iPhone with Macbook, PC or laptop with no needs to take the iPhone out of the Battery Case. It would be acceptable for iPhone original headphones and AirPods while charging, and will not affect listening to music.
PORTABLE DESIGN & 360 PROTECTIONThe slim design gives you a lighter handheld experience, and wont add too much weight while put into pocket. Youll never be worrying about the low battery and say goodbye to the clumsy charging treasure and messy data cable any more. Whats more, the combination of hard shell and soft rubber will protect your iPhone from falling and scratching.
SERVICE POLICY: We are always strive to provide great products and good services to our customers. If you have any problems in the progress of you use the products, please feel free to contact us, we will solve your problems within 24 hours, and we are very happy to give you a satisfactory solution.

6. Apple Smart Battery Case (for iPhone 7) - (Product) RED

Feature

The Smart Battery Case for iPhone 7 gives you extra battery life with the look and protection of an Apple-designed case.
Combined with the Smart Battery Case, iPhone 7 provides up to 22 hours of battery life for browsing the web, up to 24 hours of watching HD video, and 26 hours of talk time.
The Smart Battery Case also works intelligently with your iPhone to charge simultaneously when youre plugged in, so both case and iPhone will have more than enough battery life to get you through the day, and then some.
The soft elastomer hinge and one-piece design make it easy to put the case on and take it off. You can even connect it to any Lightning accessory, such as the Lightning Dock.

7. RUNSY Battery Case Compatible with iPhone SE 2020/8 / 7 / 6S / 6, 5500mAh Rechargeable Extended Battery Charging Case, External Battery Charger Case, Adds 2X Extra Juice, Support Wired Headphones

Feature

Charging and protecting, 2 in 1 function. Super fast charging. Built-in short-circuit and overcharge protection. This battery case is exclusively designed for iPhone 6 / 6S / 7 / 8 / SE 2020. It's NOT compatible with iPhone 6 Plus/ 6S Plus/ 7 Plus/ 8 Plus. Note: If the phone shows liquid has been detected in the lighting connector, which is caused by the newly updated IOS system, you could make it right by cleaning the lighting connectors on the phone and battery case.
Integrated power switch allows you to turn on/off the battery case quickly. 4-light LED indicator shows the power status of the battery case. And each light represents 25% of the power.
Slim design with accurate cut-outs. Its perfect for traveling and outdoor activities. You can also easily access to the buttons and ports of thephone without removing the battery case. Wireless charging or Apple CarPlay NOT supported.
Made of high quality material, unique and comfortable tactile impression. 360 Full Protection. Protects the phone from bumps, scratches and dust. Dont protect the screen. So its better to install a screen protector.
Built-in 5500mAh lithium polymer battery, high efficiency and high conversion rate. Adds 2x extra juice for the phone. Ideal for long distance journey and business trip. NOTE: Working temperature: 0-45. Do not place it in a hot or humid place. It's not water-proof. Improper usage may damage the product. Use only original Apple Lightning charging cables and chargers, or Apple MFi certified accessories with this device. Other non-branded or uncertified products are not supported.

8. U-good Battery Case for iPhone 7/8/SE 2020(2nd Generation),Ultra Slim/Lightweight 3200mAh Charging Case Rechargeable Extended Battery Pack Charger Case for iPhone 7/8/SE 2020(4.7 inch) (Black)

Feature

Important Notice: This battery charging case ONLY fit iPhone 7/8/SE 2020(2nd Generation)(4.7 inch). Come with a screen protector.Long-press its back power button 2 seconds to Start/Stop charging; Short-press once to check cases battery level ONLY(Wont charge) through the back 4 LED battery level lights. Support iPhone charging cable.
Add 120% Extra Battery Life: Built-in 3200mAh thin but powerful Class A Li-polymer battery cell,this iPhone 7/8/SE 2020(2nd GEN) extended battery case more than double your iPhones battery life,never worry your iPhone run out of battery,a Must have for playing mobile game,travelling,camping,business trip and other indoor/outdoor activities.
True Ultra Slim,Lightweight,Support Headphone: Thickness 13.5mm,weighs 77g only,maybe the Slimmest & Lightest iphone 7/8/SE 2020(2nd Generation) charging case on the market,NOT bulky!Support wired headphone,Airpods and Bluetooth headphone,charge and listen to music simultaneously. When you plug iPhone charging cable into case with phone inside,it will charge Phone first until fully charged,then begin to charge the battery case.
Charging Safely,Max Protection,SYNC: Ugood Battery case uses premium polymer batteries(UL2056,UN38.3 certificated),fire-proof plastic housing and smart chips to ensure safe charging,prevent your iPhone from short-circuiting, overheating and over-charging/discharging. Hard-shell design and a glass screen protector can max protect your iPhone from daily scratch. SYNC your iPhone to Macbook/PC/Laptop without removing this case charger.
What you Get: 1 x Battery case for iPhone 7/8/SE 2020(2nd GEN),1 x Glass screen protector,1 x Top cover,1 x User Manual.

9. Battery Case for iPhone 8 Plus/7 Plus/6 Plus/6s Plus(5.5''),Upgraded 8500mAh Protective Portable Slim Charging Case Rechargeable Extended Battery Pack for iPhone 8 Plus/7 Plus/6 Plus/6s Plus - Black

Feature

ADD 150% Battery LifeThe Battery Case for iPhone 7Plus,8Plus,6s/6 Plus has 8500Mah Built-In Lithium Polymer Battery Chip, which means you get additional 150% battery power for your phone, it also provide you extra 60 Hours Audio Time and 18 Hours Talk Time.
Compatible ModelPlease Note This Battery Charging Case is Only Fit For iPhone 8Plus/7Plus/6Plus/6S Plus (5.5 Inch), Not Compatible With iPhone Lightning Headphone, but iphone 6 plus/ 6s plus can use Traditional 3.5Mm Headphones, It can also Work With Apple AirPods Or Other Wireless Bluetooth Headphone.
Advanced Sync-Through TechnologyAmazing Sync-Through Technology That You Can Simultaneously Charge Your iPhone And iPhone 6/6s/7/8 Plus Battery Case Together ,Conveniently Sync Your iPhone To Your Mac book, Pc Or Laptop Without Having To Take The Battery Case Off.100% Compatible With All IOS Versions, Apple Pay, And Future IOS Software Updates(Apple Car play Is Not Supported).
High Level ProtectionThis iPhone 7 Plus/8 Plus/6s Plus/ 6 Plus Charging Case With Scratch-Guard, Can Protect Your iPhone From Scratches And Other Daily Wear And Tear. The Intelligent Power Charging Protection System Could Protect Against The Battery Case And Your Phone From Over-Current, Over-Charging, And Over-Heating For Safe And Reliable Fast Charging.
Customer GuaranteeIf You Are Not 100% Satisfied With Your iPhone Battery Case, Please Feel Free Contact Us For Help.30 Days Full Refund,18 Months Warranty.

10. Battery Case for iPhone 8 7 6s 6 SE 2020(2nd Generation), 3200mAh Portable Rechargeable Protective Charging Case Extended Battery Pack Charger Case for iPhone 8 7 6s 6 & SE 2020 (4.7 inch) -Black

Feature

Important NoteOnly compatible with iPhone 8 /7 /6s /6 /SE 2020. NOT works on iPhone 8 Plus /7 Plus /6s Plus/6 Plus(5.5 inch) or any iPhone Plus model. Carplay and Wireless are not supported. Press the back power button for 3 seconds to start charging.
Add 110% More Battery LifeEquipped with powerful 3200mAh built-in lithium polymer battery chip add more than 110% battery life to your iPhone 8 7 6s 6 & SE(2020). It means add extra 20 hours talk time, 12 hours Internet use, 4 hours game time and 60 hours music time. Say goodbye to low battery anxiety and awkward moments.
Protection & Charging 2 In 1This iPhone 8 7 6s 6 SE(2020) charging case designed to provide heavy duty level protection, bumper and hard-shell backplate can protect iPhone from scratches and falling. Smart design makes your camera and screen more secure.Internal safe chips prevents the power case short-circuiting, overheating and over-charging.
Advanced Sync & ListeningFeaturing Sync-through technology that you can sync your iPhone to a computer without taking off the battery case. Compatible with AirPods,lightning headphones, and traditional 3.5mm headphones and wireless Bluetooth headphones, you can listen to music and charge simultaneously by using the detachable backup portable charger.
What You Get1* iPhone 8 7 6s 6 SE(2020) charging case, 1* User Manual. Swaller cares about the shopping experience of our customers, If you have any questions, issues or concerns please contact us and we would be more than happy to assist.

Conclusion

By our suggestions above, we hope that you can found the best iphone battery case 8 slim for you. Please don't forget to share your experience by comment in this post. Thank you!