Galaxy S8 Battery Case

Rated 5.00 out of 5 based on 22 customer ratings
(22 customer reviews)


Galaxy S8 Battery Case, CASESSARY Quick Charge 3.0 Protective Charger with Priority Charge + Dynamic Power Management, 4500mAh Portable External Battery Pack for Samsung Galaxy S8 5.8 inch (Black)

★【STAY CHARGED ANYWHERE】: World’s 1st and ONLY battery case compatible with Qualcomm Quick charge 3.0, with a long last 4500mAh Li-Polymer battery (>800 Life Cycle). Built into perfection with all features you need.

★【FULL 360° PROTECTION】: Designed with perfectly raised bezel, ergonomic anti-slip pattern, cushioned frame and rugged outer-shell. Provides superior protection against drops, hard falls and scratches. Plus premium patterned surface with anti-slip and fingerprint proof features.

★【PRIORITY PASS-THROUGH CHARGING + OTG DATA TRANSFER】: Your phone will receive full-charge 1st and then begin to automatically re-charge the case in less than 2 hours. Plug-and-Play technology allows easy data-synchronization without having to remove the case.

★【DYNAMIC POWER MANAGEMENT】: Protect phone's battery life by optimize the charging speed when battery is empty or close to full. Sophisticated protective logic+ temperature sensor, prevents your device from over-heating / over-charging. Hex LED lights indicate an accurate power level.

★【LIFETIME WARRANTY】: Money Back Guarantee and Extended 2 Years Warranty. Upgrade to Lifetime Warranty by following @CASESSARY on Facebook, Twitter and Instagram.

SKU: BTC001S8BK Categories: ,

The CASESSARY Galaxy S8 battery case provides you QC 3.0 fast charging and full protection. Made with ergonomic anti-slip and durable design to protect against drops, bumps, scrapes, scratches and hard falls.

1. Build-in high-capacity lithium-polymer battery, double the standby time for your Galaxy S8.
2. Premium material to protect your phone, charging and protecting 2 in 1.
3. USB OTG data support, enjoy fast data transfer without removing the battery case.
4. Integrated safety features with temperature control, effectively avoid short circuit or overcharge even under extreme conditions.

★ Please use original charger or compatible QC 2.0/3.0 charger to ensure quick recharging speed.
★ Do not place battery case to fire / excessively hot environment.
★ The surface of this battery case may gradually become warm when charging.
If there’s any problem when using our devices, please kindly contact us with the contact info enclosed on the service card, we are always here to help.

• Compatibility: Only for Samsung Galaxy S8 5.8 inch ( Not compatible with Galaxy S8 Plus )
• Battery Capacity: 4500mAh
• Battery Type: Li-polymer
• Input: DC 9V-1.67A, 15W
• Output: DC 9V-1.4A, 12.6W
• Material: PC+ABS

Package Contents:
• 1x 4500mAh Galaxy S8 Battery Case
• 1x User Manual

22 reviews for Galaxy S8 Battery Case

  1. Rated 5 out of 5

    Sandy Chen

    This is a great product. The case holds the phone tightly, unlike some cases that I have tried. All of the cut-outs fit perfectly and allows the phone side buttons to protrude through the case which makes using them much easier than some other cases. The battery keeps my phone charged and has prolonged my battery life greatly. I was overnight charging my S8 each evening until I bought this product. Now I charge the phone every 3 or 4 days. The case is rather bulky and adds several ounces to the overall weight. However, the increased capacity makes it worth the additional heft.

    I access my cell between 35 and 40 times a day. If you are a heavier user than I am, you may not get the same longevity but I’m sure this item will increase your battery capacity enough to justify it’s purchase price.

  2. Rated 5 out of 5

    George Daughtery

    I was hesitant because of the cost. I used to carry around a battery backup USB stick. What a pain that was! This battery case is not nearly as heavy or bulky as I feared it would be. It fits in my pocket well. It gives the added juice needed so I don’t have to stress about a day where I’ll be away form a charger all day long. I no longer have to monitor my usage in fear that my battery will run low because I know I can just flip on the battery backup and I’ll be fine. The reduced stress alone makes this product very worth it. Its also a well built case that looks and feels natural. Worth the money.

  3. Rated 5 out of 5

    Leo Palmer

    Very nice battery case, quick charge and very nice grip and some protection, however BEWARE!! Case randomly starts charging phone in your pocket, I guess the button is too easy to press so it accidentally gets pressed in your pocket. So when you actually need it, you have no juice left….

    UPDATE: company has reached out to me after writing this review and offered to replace the case FREE of charge , they immediately issued an RMA form to return the old case. that is why I changed my stars from 3 to 5, customer service is 100%, case also offers VERY NICE PROTECTION in the front with a raised LIP (many others dont have that).

    UPDATE # 2:
    On top of replacing the case they also offered me 50% off of any future purchase from them, which a very nice gesture. Like I said before the customer service is there! And its GREAT!

  4. Rated 5 out of 5

    Brandon Syar

    I like this one. I have another product but I would have to take it out of the case to sync with the computer. I do not have to do it with this one. It also charges quicker. I bought a second one for a co-worker and she loves hers, also!

  5. Rated 5 out of 5

    Fang Hou

    Got this case for my dad as a birthday gift. Totally great quality and the battery works great for him and me. He always forgot to charge his phone at night and battery dies during the next day. This case actually helps him to stay connected :).

  6. Rated 5 out of 5

    Manny Gerald

    The battery charges very quickly and can charge the phone while the phone is plugged into case. The case is rugged and can survive drops from a reasonable height. Very easy to see the battery charge status. Have averaged 2 full phone charges when the battery case is fully charged.

  7. Rated 5 out of 5

    Elizabeth Manzo

    Protects and charges phone fast.

  8. Rated 5 out of 5

    Ted Johnson

    It’s fits the phone perfect. Good grids and solid. It charges fast and protects the phone well.

  9. Rated 5 out of 5

    Tanya Carreras

    It’s original it’s great & perfect.

  10. Rated 5 out of 5

    Andy Guang

    I have had charging cases before, but the grip and the overall quality of this case has separated itself from the rest of the competition.

  11. Rated 5 out of 5

    Elias Brodbeck

    It’s a good case-charger works very well and I like it!

  12. Rated 5 out of 5

    Chris Li

    Case is awesome. The touch is really good. Of course the battery works perfect. Life saver!

  13. Rated 5 out of 5

    Christine Walsh

    Shipping fast, great product! I love it!

  14. Rated 5 out of 5

    Shawn Lius

    I bought this for my dad. He needs an extra battery life. Fits perfectly in his Galaxy S8. Worth it.

  15. Rated 5 out of 5

    Jingyin Jiang

    I was skeptical at first, but after using this for a couple days, it turned out to be a solid device.

  16. Rated 5 out of 5

    Jo Kendall

    Purchased this as a gift for a friend. It is nicely designed and sturdy, protected his phone well when it fell on the ceramic ground. It is neat that it charges both the phone and battery case in a short time.

  17. Rated 5 out of 5

    Brenda Barros

    Believe it! This case is Built into perfection with all features you need just like the company claims. My son has autism and was just in hospital for tests for 5 days. To say he was bored to distraction is an understatement. So, while in hospital, I let him use my phone which, thank goodness, had this case on it. He had an adverse reaction to a medication which made him hyper agitated and, on several occasions, threw, with considerable force, my phone against walls and around the room before I could get to it: neither the phone nor the case was damaged. A week or two later, on a trip to the Mall, he dropped the phone over the second level railing down onto the first floor below: thankfully, not on to anyone’s head. I leaned over the railing, calling down to passersby to advise that someone was coming right down to get the phone. A small crowd gathered after it was determined that, miraculously, the phone was still working and the case was intact! After the Mall incident, the automatic charging button sticks. It still works, but I have to connect it to the charger first. Still, this is the best phone case ever! I know it has a lifetime warranty but no one could have anticipated this kind of test. I am buying another case right now: I am a customer for life!

  18. Rated 5 out of 5

    Cherry Candello

    Awesome! I’m not on my phone all day so I can go 3 days without charging it.

  19. Rated 5 out of 5

    Polly Genovese

    I loved it when it worked, then the case would no longer charge. Called customer service and left a message, no response. Now disappointed.
    Update: Customer service was excellent! They sent me a new case and kept me updated on it’s status, so I changed my review to 4 stars!

  20. Rated 5 out of 5

    Jeff Geller

    This case gives the phone 1 additional charge and works well as a battery case. My one issue is that the led lights on the back don’t properly display the amount of juice it has left. I emailed the seller about this and they responded that they are aware of the issue and looked into it. They sent me an email telling me what the led values actually are based on their research (better than guessing) and this is what they came up with: 3 lights and below is <25 and 4 led means somewhere between 25-50%. They also said the next batch would have a fix and they would allow me to exchange it when they get it (let's see if that happens-will up my rating if I get a new one).

    Other than that, the case does add some major bulk (as expected) but provides good protection and functions as it's supposed to.

  21. Rated 5 out of 5

    Steve Wren

    This is an honest review. I’ve noticed a lot of what appear to be fake reviews on this product. Not sure exactly why because the product is OK and it it is a fairly decent case. It’s bulky (to be expected) and heavy. A little slippery and has a plastic feel. Getting the S8 in is easy. Getting the S8 out is really bad. I thought I was going to break my camera or finger print sensor. I wasn’t planning on using this case all the time and seeing it’s so hard to remove it’s not for me. If you’re OK with a heavy, bulky case for added battery life you should give it a try. It does appear to be very well made and the LEDs on the back showing how much power is left are very nice.

    Edit: Very impressed with support. Raised to 4 stars. I plan to try again when easier to remove.

  22. Rated 5 out of 5

    Beverly Terusa

    I love this case, but I have one problem, the case appears to charge by itself. So it is not always fully charged when I need it. Otherwise I would have given it five stars.

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