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Mugen Power 4000mAh Extended Battery for AT&T Samsung Galaxy Exhilarate I577 with Battery Door [HLI-I577XL]


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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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Worth the money.

14 November 2014


With shipping 100.00 dollars is a lot but I am happy with what my current phone supplies me. The Mugen battery lives up to the hype it last a long time in between charges and gives you a sense of freedom .


Overall: Awesome

5 October 2013


Like the other reviewer, my Samsung Galaxy Exhilarate was lasting maybe 18 hours at best. I've had some 12 hour days and that's not acceptable.

I bought a Mugen battery and cover off ebay. Here are my actual test numbers after a full charge:
-After 24 hrs: 71% charge remaining
-After 36 hrs: 40% charge remaining
-After 48 hrs: 21% charge remaining

Those numbers are based on moderate use consisting of phone calls, texting and checking email, and maybe a little hill climb. I wasn't using GPS, facebook or youtube.

The charge time go from 21% to full charge was "about" 2hrs. I didn't monitor the charge time as closely as I should have.

The phone is now about 0.7 inches thick with the new battery. I actually like the size better when I'm holding the phone. It's a little more bulky in my pocket. The phone is obviously heavier with the larger battery. It is a noticeable increase in weight.

Overall, I'm happy with the product.



13 August 2013


the Samsung Galaxy Exhilarate now lasts 1-2 days full where as before with 1750mAh it would last maybe 14-17 hours with minimal use. Now can use for normally without worrying about battery drainage.

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