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Sale – Limited Stock

Mugen Samsung Galaxy S4 Extended Battery (5500mAh) - Black

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Product Reference: 39658

Extend the life of your Samsung Galaxy S4 with this 5500mAh battery and battery door extension. In black.

  • "Worthwhile replacement battery"
  • "much tinner than expected"

Most Useful Customer Reviews

Gym Bunny
Samsung Galaxy S4
15th January 2016
Worthwhile replacement battery
I bought this extended battery to replace my original S4 battery which was approaching 2 years old and perhaps suffering some decline in capacity since new. Portable battery packs are all very well but using my phone with an OTG cable in the gym means I am dependant on just the battery. With my old battery I could only manage about 90 minutes from 100% to below 10% (screen on constantly running an app, connected through OTG, streaming radio through WiFi to Bluetooth earbuds & receiving heart rate data from a BTLE chest belt to a different app). Longer workouts had to be tech free. With this battery in place I no longer need to make sure I am bang on 100% before I start a workout. I am so confident in the capacity of this battery that I started this mornings workout (90 minutes as above) at a frankly reckless 82% battery. Having finished & arrived at work I am still at 59% The larger back supplied to accommodate the battery does make the phone about 2.5 times as thick and noticeably heavier but I still find it comfortable to hold.

galaxy s4 9506
15th January 2016
much tinner than expected
my galaxy relay s4 extended was much ticker than this one. i guess i would prefer bigger one. on the plus side it fits well in belt pouch biggest size avaiable freely on ebay. as for battery, holds about 2 day charge of moderate use. as exptected. coulld potentialy squeze third day as about 30% im using now, but i prefer to stay on a safe side. no any abnormal heating observed. didnt test nfc as never needed to so far. mugen quality. mugen power. mobilefun price ;) positivly surprised here. not only they are rare now, but even got in a good price. shame i didnt know about this site before when i got my battery off directly from mugen. battery cover fits well, alto in one place it can stil out a bit, could be i didnt close it properly. texture is fine alto i prefered the relay ones, as this one is more sparkly and little more slippery. still better grip than original one which under certain conditions gonna be real pain.

Read 8 customer reviews | Write a review

Why Buy?

  • Extended battery adds 5500mAh to your Galaxy S4
  • Compatible Battery Door
  • Quality assured
  • Guaranteed for one year


Extended battery adds 5500mAh to your Galaxy S4

The original Samsung Galaxy S4 battery is 2600mAh, this Mugen battery is 5500mAh. This more then doubles the original battery life giving you double the time for watching videos and listening to music. 

Mugen Samsung Galaxy S4 Extended Battery (5500mAh) - Black

Compatible Battery Door

The extended 5500mAh battery is an absolute powerhouse however the increased battery power means that the battery size will increase. Mugen therefore includes a compatible battery door that will house the extend battery perfectly, whist keeping bulk to a minimal. 

Quality assured 

All Mugen Power batteries undergo vigorous QA procedure, resulting in Mugen Power achieving the lowest return rate in the industry. All Mugen Power batteries are CE approved.

Guaranteed for one year

The cells used for these Mugen batteries are of such high quality, they are guaranteed for one year. Something other manufacturers don't do. 



  • Cell Type Li-ION
  • Voltage 3.8v
  • Capacity (mAh) 5500)

Key Details

  • Colour: Black
  • Part No: HLI-I9500XL

Samsung: Galaxy , Galaxy S4

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