---
product_id: 158326142
title: "Alpatronix Galaxy S9 Battery Case, BX440 4000mAh Slim Portable Protective Extended Charger Cover with Qi Wireless Charging Compatible for Samsung Galaxy S9 (5.8-inch) (Black) [Upgraded]"
brand: "alpatronix"
price: "€ 2.71"
currency: EUR
in_stock: false
reviews_count: 8
url: https://www.desertcart.com.cy/products/158326142-alpatronix-galaxy-s9-battery-case-bx440-4000mah-slim-portable-protective
store_origin: CY
region: Cyprus
---

# Alpatronix Galaxy S9 Battery Case, BX440 4000mAh Slim Portable Protective Extended Charger Cover with Qi Wireless Charging Compatible for Samsung Galaxy S9 (5.8-inch) (Black) [Upgraded]

**Brand:** alpatronix
**Price:** € 2.71
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** Alpatronix Galaxy S9 Battery Case, BX440 4000mAh Slim Portable Protective Extended Charger Cover with Qi Wireless Charging Compatible for Samsung Galaxy S9 (5.8-inch) (Black) [Upgraded] by alpatronix
- **How much does it cost?** € 2.71 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/158326142-alpatronix-galaxy-s9-battery-case-bx440-4000mah-slim-portable-protective)

## Best For

- alpatronix enthusiasts

## Why This Product

- Trusted alpatronix brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

Overview:The BX440 battery case is designed by Alpatronix to improve the performance and battery life of your Samsung Galaxy S9. Built for the avid Android user and extensive use, the BX440 is excellent for traveling, work and on-the-go protection. The BX440 supports Qi wireless charging! Simply place your battery case on any wireless charging pad and it will automatically start charging your Galaxy S9 first and then your battery case.From Alpatronix, your Electronic Gadget Provider!Designed exclusively in California, USA Full 1-Year Warranty Extended Lifetime Warranty 99% Positive  Store FeedbackOver 35k+ Lifetime Store Ratings & Counting...Portable & Compact Lifesaver Wherever life takes you, save yourself from having to search for a power outlet. Designed for portability and protection for any lifestyle.Incredible Battery Life4000mAh battery capacity and UL-certified internal battery provides enough power to last your the entire day.Certified Compatibility100% full compatible support with older/current Android OS as well as any future Android OS software updates, preventing any incompatible error messages. Hassle-free Warranty We fully stand by our products, providing a 12-month worry-free warranty and friendly, easy-to-reach support. Lifetime warranty is also available at no extra cost. Important Notes: USB-C Cable NOT included, use cable that was provided with your Galaxy S9. AUX/Headphone port access.Do NOT store battery case in high temperature environments, including intense sunlight and/or heat.

## Features

- About this item
- Powerful Rechargeable Case: Incredible 4000mAh UL-certified internal battery delivers more juice and life to your Galaxy smartphone to keep it charged and last the entire day, for up to 24+ hours. 100% compatible with Android 9 (Pie) or older, future Android OS software updates.
- Qi Wireless & Wired Charging: Charge the battery case with a wireless charger (not included) for a quick and convenient wireless charging experience. You can also sync data, transfer or charge the battery case directly using the USB-C cable that was included with your Galaxy S9 without removing the case.
- 360° Protection: Protects your Galaxy S9 phone from every day wear. Raised bezels offer front and surface protection. Includes the highest industry regulatory certificates: CE, RoHS, and FCC. Only compatible with Samsung Galaxy S9, 5.8" (NOT compatible with Galaxy S9 Plus, 6.2").
- Easy Installation: Remove top piece, insert Galaxy S9 by sliding into the USB-C's output port, then reconnect top piece by snapping it back into place. You can charge and sync both the case and S9 phone to your computer without having to remove the case.
- What You Get: Alpatronix Battery Case, User Manual & 1-Year Warranty (Lifetime Warranty is also available at no extra cost). We're a California-based company, designed in the USA including our friendly customer service.

## Images

![Alpatronix Galaxy S9 Battery Case, BX440 4000mAh Slim Portable Protective Extended Charger Cover with Qi Wireless Charging Compatible for Samsung Galaxy S9 (5.8-inch) (Black) [Upgraded] - Image 1](https://images-na.ssl-images-amazon.com/images/I/61S0yKyMzbL.jpg)
![Alpatronix Galaxy S9 Battery Case, BX440 4000mAh Slim Portable Protective Extended Charger Cover with Qi Wireless Charging Compatible for Samsung Galaxy S9 (5.8-inch) (Black) [Upgraded] - Image 2](https://images-na.ssl-images-amazon.com/images/I/81C%2BbXqCt8L.jpg)
![Alpatronix Galaxy S9 Battery Case, BX440 4000mAh Slim Portable Protective Extended Charger Cover with Qi Wireless Charging Compatible for Samsung Galaxy S9 (5.8-inch) (Black) [Upgraded] - Image 3](https://images-na.ssl-images-amazon.com/images/I/812rShHWrNL.jpg)
![Alpatronix Galaxy S9 Battery Case, BX440 4000mAh Slim Portable Protective Extended Charger Cover with Qi Wireless Charging Compatible for Samsung Galaxy S9 (5.8-inch) (Black) [Upgraded] - Image 4](https://images-na.ssl-images-amazon.com/images/I/81B615KSEDL.jpg)
![Alpatronix Galaxy S9 Battery Case, BX440 4000mAh Slim Portable Protective Extended Charger Cover with Qi Wireless Charging Compatible for Samsung Galaxy S9 (5.8-inch) (Black) [Upgraded] - Image 5](https://images-na.ssl-images-amazon.com/images/I/817j26DMYUL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐ 







  
  
    Set's Mind At Ease Knowing Have Recharge At Fingertips Without Cords or Electric Outlets
  

*by C***E on Reviewed in the United States on October 7, 2019*

I have now had the product for a week and took notes while using it.It is a little heavy, but worth the extra weight for its usage.One day I let my phone battery run down to 59% at 1 pm and at the time had 4 bars for battery charge in the case.  At 2 pm my phone was fully charged back up to 100% and it only used 1 bar as I still had 3 bars showing on the back of the case.  Good Right!  I have to warn you that the case does get quite warm when it is transferring its juice to your phone.  But nothing that can't be tolerated.Other days went similar: 67% at 10:35a with 3 bars; turned on and reached 100% at 11:26a bars dropped down to 2.However, there were days with a glitch like these two:59% at 8:57 am with 2 bars on back; checked phone at 9:37 am and the phone was only charged up to 67% and the charge had kicked off and was no longer charging from case to phone.  So I tried to turn the charging back on at 9:38 am with 1 bar left, but it would not turn the charger on with just the 1 bar and I had to use my cord by plugging it into the electrical outlet and the other end on my phone in order to charge from the 67% to the 100% plus get the case battery back up to 4 bars.  From 9:39 am to 11:42 am the phone battery went to 100% but there was still 1 bar on case battery. At 2:09 pm phone still 100% and case went up to 2 bars. At 3:42 pm phone still 100% and case finally went to full 4 bar charge.  So, in essence, it took 6 hours for the phone to charge back up to 100% and battery case to charge back up 100% to 4 bars, but with needing to plug in my charging cord.Another day at 12:30 am the phone was at 43% with 4 bars on case so turned it on to charge phone from the battery case.  At 4:30 am it had kicked the case charge off with the phone only having 86% and the case having 3 bars.  At 4:31 am turned case charger back on a with its 3 bars and at 7:25 am the phone was at 100% with the case having 1 bar, so I plugged in the phone to an outlet and at 10 am the phone was at 100% with the case having 4 full bars.It was disappointing that on some days the case charger was kicked off randomly.  Not good if you are counting on getting a full charge.  One does not always watch the pot boil (look at the phone constantly to make sure it is charging from the case to the phone).  And if one is depending on a full charge and only ends up 67% or 86% or whatever percentage it decided to kick off at, one is going to get a rude awakening for whatever you had planned for that hopeful 100%.But overall, this battery charger is very convenient to have.  Saves one from carrying around an electric cord charger and worrying if there is an outlet nearby.Great for things like going to a wedding and not wanting to run out of juice mid way.  Or going on a trip and taking lots of pics and vids and not having to worry about the battery running down completely and missing those once in a lifetime pics.The case also seems to be very heavy duty for protection of a very expensive phone which is a bonus.  As you are not only getting an extra battery for your phone, you are getting a great protective case for your phone.The price is not inexpensive, but not over-priced either.  Definitely worth the cost for what it provides.I think Alpatronix may have a few bugs to still work out to make this battery charging case perfect, but as is, still a good investment and product that meets the consumers needs.

### ⭐⭐⭐⭐⭐ 







  
  
    Great Qi compatible phone case
  

*by J***N on Reviewed in the United States on September 23, 2019*

This is my 4th Alpatronix battery case. I have purchased one each time I upgrade my phone, and I bought one for my wife and daughter. They are great cases!  My phone will almost be dead by the end of the work day, and the case provides rapid charging to completely recharge my phone with some charging still left over for later. The case is quite thick, but not really much more than a normal case would be.  It has a solid feel with a smooth texture, but not slippery at all.  I never worry about it slipping out of my hand. One of the things I love most is the fact that it is Qi computable for recharging.  I don’t have to find a cord and I can just took it on my charging pad when I walk in the door.  The case charges the phone first, and then the case, but it does rapid charge both of them.  The only complaint I had before was the fact that the buttons on the side tended to break from spending all day in my pocket, but the case was still functional. When I received my new case today that problem has been fixed.  The material that covers the buttons now has metal inside so no matter how many times I push the volume or power buttons they are not going to ever break off again.  I’ve tried other battery cases and this one is superior to all of the others I have tried.  I highly recommend it.Pros:Qi chargingMore that a full charge with power left overSmooth but textured no slip caseReinforced buttons that are sturdySolid protection for drops (I have dropped my phone multiple times and no damage to my phoneGreat customer service if you have any problemsCons:  None

### ⭐ 







  
  
    Poor quality plastic, No Quick Charge compatibility
  

*by S***N on Reviewed in the United States on March 3, 2020*

Poor quality product.  First one came broken.  Amazon replaced it for me.  The second one lasted two months before the tab for the power button broke off, forcing me to jab my fingernail into the hole to turn off my screen.  The built-in battery is decent and has functioned as intended, but gets incredibly hot while being discharged.  The Qi charging is good, but does not support Quick charge either via Qi or wired.  The case itself is very slippery and the buttons are so low profile that I had issues holding onto the phone.  I was initially able to get the unit to work on the Qi charger with a Pop-socket, but after a couple weeks, it would start charging for about 10 seconds then stop, then start again continuously.

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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-03-01*