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Mugen Power 3600mAh Extended Battery for Nokia Lumia 820 with Battery Door [HLI-820XL]
Mugen Battery will last 2.18 times as long!

Regular Price: $89.50

Special Price: $79.50

Ships on October 30, 2015.

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Mugen Power Extra Strong Extended Replacement battery.

Additional Information

Cell Type Li-ION
Voltage 3.7v
Capacity (mAh) 3600
Battery Door Included
Original Battery Model BT-5T (1650 mAh)

Mugen Battery will last 2.18 times as long!

Mugen Power Extra Strong Extended Replacement battery. Express Shipping Worldwide!

Mugen Power is the worldwide leading brand of high performance batteries for portable electronic devices. Mugen Power means Performance and Quality.

Mugen Power batteries have better performance (higher capacity) and reliability (longevity & safety) than other brands. The superior performance improves run time, often doubling that provided by the original brand replacement. The superior quality results in longer battery life and better protection of the powered device.

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

Mugen Power batteries are premium product and designed for experienced users, who understand importance of quality for long battery life and safety of everyday use.

See what others say about Mugen Power Batteries:

"Go buy one, well worth it!"

"The extra size and weight increases pale into insignificance when you consider the true convenience the battery gives... it represents excellent value for money."

"a much better choice"

"This is the second Mugen Power Battery that I own and I can't think of me having a Pocket PC without a Mugen Power Battery on it. This battery gives me the freedom of mind of not having to think about to recharge the battery everyday after work."

Longer Battery Life Premium QualityStandards Compliant

Worldwide delivery: We ship to any address Worldwide

Shipping Method: We ship your order using World-class Courier Services so You get your products securely and as fast as possible.

Online Tracking: Right after your order is shipped, we send an email with online tracking information.

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Mugen Power Satisfies

Returns & Exchanges:

If you are not 100% satisfied with puchased products, you can return your order to us for a full refund or replacement.

Return Merchandise Authorization (RMA) number is required on all returns. All items returned without RMA number will not be accepted and refused.

To obtain a Return Merchandise Authorization (RMA) number, please contact us for further instructions. Returns or exchanges are made within 1 year after the purchase date. If possible, items should be returned with all parts and accessories, and in original packaging, including the manual, the inserts, the RMA number and a copy of the packing slip or invoice.

We will process exchanges or refunds within 1-2 weeks of receipt.


Customer Reviews

Overall Rating

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Items 1 to 10 of 13 total

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Very Good! Wish all phones have this upgrade option.

11 September 2015


It was rough the first few weeks with the phone software not yet calibrated making the run time not much different from my oem battery (which has an average time between charges of 12 hours). After a few weeks battery life would gradually increase. It has been about 3 months now and I am very happy as slightly used and with the gps off, 20% usage of wifi and bluthooth always on and minimal data usage, I only need to charge about 2-4 times a week. I also am not playing much games as I use my pc for that and my phone is a communication and mapping device.
I wish all late model phones has this upgrade option (phone thickens a bit in exchange for 100+% increase in battery capacity.) This upgrade actually made my aging lumia 820 more desirable compared to the majority of phones being released lately.



11 April 2015




Very Good!!!!

20 October 2014


I can use the phone so much longer. Very Good!!!!

A little bit bigger = no problem!

Thank You.


Mugen Power 3600mAh

3 April 2014

Juergen Tolksdorf

Everything was fine! The battery works very well. The original battery has power for less than 24 h. The 3600mAh battery form Mugen has Power for mor than 2 days. I´m content with the battery from Mugen.


works perfect

26 February 2014


double/triple normal usage time


Хороший товар

30 January 2014


Трое суток заряд держит,я доволен.


Excellent product

20 December 2013


La batteria dura più del doppio della tradizionale, e la cover si applica perfettamente al telefono. Ottimo acquisto se hai bisogno di lunga durata della batteria per uso intenso.



28 October 2013


As far as the New Battery and the New Backplate; They are Excellent. The quality and performance are great, and I can now use my phone for more than a few hours or a whole day without worry. This batery has made this phone "useable".

As for the Nokia's still the same Nokia Lumia 820. I have put it onto battery saver mode 100%, I turn-off bluetooth and WiFi when not in use, and continuously remember to back-arrow (close) ALL open operations. It continues to be the dumbest "smart phone" I've ever owned. This NEW Battery has given it a new lease on life!



23 October 2013

Igor Rafael

Works perfectly, thank mugen!


Very good battery. Sehr guter Akku

30 August 2013


Very good battery
There will be a review soon September 2013 on

Sehr guter Akku
Einen Testbericht wird es bald September 2013 auf geben.

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