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Home » Slim Case with Slide-On battery for iPhone 4

Slim Case with Slide-On battery for iPhone 4

We seldom feature iPhone cases around here but this new one from has an interesting proposal. Instead of a built-in battery ticked into a bulky case, Third Rail made it optional as a slide-on pack.


The case is made of solid polycarbonate materials in a matte black finish. The inside, at the bottom end there’s the proprietary 30-pin Apple USB port while the top section slides out to make way for the iPhone to fit inside the case.

The case itself is relatively thin (around 2mm) but the construction extends the height of the whole assembly by at least 2 centimeters at the top and bottom end.

The back panel has 4 small, rectangular holes where you can snap in the external battery. There’s a set of 3 metallic contact points around the middle section for the charge to pass thru.

At the bottom of the case is where the micro-USB port is located along with a switch for the charger.

The slide-on battery is also interesting. It comes with 2 micro-USB ports — one for input and one for output (probably to be able to daisy-chain the power charging).

The back of the battery also has the same 3-pin contact points which allows for another slide-on battery to ride on top of it. It’s a pretty interesting proposition but I reckon the iPhone might not be that usable when you have several batteries stack on top of each other.

The Li-Ion battery is rated at 1250mAh and is able to re-charge my iPhone 4S from 9% to 70% before it completely drains up. With the case snapped on, you can now hook up your iPhone via a micro-USB charger as well.

The case is available in local stores like Digital Walker or Digital Hub for about Php3,850USD 66INR 5,562EUR 62CNY 478. Seems to be a little on the expensive side though (that is, if you consider buying a separate slim case and external battery instead).

Anyway, if you have an iPhone 4 or 4S, you might want to have this review unit for yourself.

So we’re raffling it off with Rafflecopter below.

a Rafflecopter giveaway

Update: And our winner is…

Congrats! Email me for instructions on how to claim your prize.
Disclosure: Digits Trading provided for the review unit. They are also a display banner advertiser on this site.

Abe Olandres
Abe Olandres
Abe is the founder and Editor-in-Chief of YugaTech with over 20 years of experience in the technology industry. He is one of the pioneers of blogging in the country and considered by many as the Father of Tech Blogging in the Philippines. He is also a technology consultant, a tech columnist with several national publications, resource speaker and mentor/advisor to several start-up companies.
  1. Gonna try my luck again :)

  2. Really need this one.

  3. Hoping to win.

  4. me too.

  5. Trying my Luck, I own a 4.

  6. iphone 4s – last year

  7. iPhone4s. Got it last February 2012

  8. I got my girlfriend an iPhone 4 for our anniversary. It was a bit late coming coz we got scammed by a bogus seller. I was supposed to get us both iPhones. Instead, I ended up getting her iPhone in November, then I got my Galaxy Note in January. I hope to get this one for her too :)

  9. Like…. looks good for my iPhone 4 and iPhone 4s

  10. iPhone 4S. Last January

  11. AWESOME Raffle! I want it for my iPhone 4S that I got last Feb! :)

  12. got my iPhone 4s last april :D

  13. iPhone4s. May 2012.

  14. iphone 4s, won it over facebook from an international giveaway, dec. 11 lastyear! i need that free case for my iphone 4s that i got free :)

  15. I got my iPhone 4S last month and this case would support the power my iPhone’s battery.

  16. iPhone 4s
    December 2011

  17. i have a white iphone 4s, hubby gave it to me last xmas :)

  18. i just got my iphone 4s from Smart :)

  19. I love my iPhone 4 birthday present from my hubby last year (august)..

  20. i got my iphone 4s from globe

  21. iPhone 4. Got it last year.

  22. Want one :)

  23. Got an iPhone 4S from Globe postpaid.

  24. got an iphone 4 32gig this year!

  25. 4S. January 2012.

  26. in cae I win Im going to give it to my friend for his iphone 4s :)

  27. wow!! slim form factor and cool design! hope i win~ :)

  28. wow!! slim form factor and cool design! hope i win~ :)

    iphone4 32GB

  29. this is nice :)

  30. Have an Iphone 4S, got it last January. :D

  31. i always wanted to have this kind of case kaso lang ang mahal.. haha.

  32. iPhone 4S got it last Feb :)

  33. I got my 4s last January 10, 2012

  34. iphone 4 got it september last year

  35. iPhone 4S got it last December from Globe >.<

  36. iphone 4. I got it last year.

  37. I hope I win! Thanks! I got iphone 4 last year.

  38. iphone 4. got it last year.

    What an awesome giveaway! Thanks for the opportunity!

  39. Whoohoo hope I win

  40. iphone 4. I got it last year.

  41. I own an iphone 4 and got it last year.

  42. iphone 4 from last year

  43. 4s, december 2011

  44. Got an iPhone 4S last February 2012. FTW!

  45. Hmmm the design looks familiar? It looks like a c-peel (used for converting apple i touch to phone). Ganyan na ganyan din, may top sleeves din…hehehe

    Anywau i dnt own an iphone….so good luck sa mga sumali. :)

  46. This looks great on my iphone 4S.

  47. sorry about my last post.
    iphone 4s and Feb 2012.

  48. An Iphone 4. I got it July last year

  49. I own an unlocked iPhone 4S! Got it last January.

    We all know about its poor battery life. Now, this will do the trick! :P

  50. i have an IPHONE 4! i got it last dec of 2011 pinag-ipunan ko talaga para makabili ako ng iphone4.

  51. i have an iphone 4, got it last March

  52. I own iphone4 and got it last year!

  53. iphone4 december 2010

  54. I don’t own an iPhone4 but I’m planning to give this to my bro-in-law if ever I win this ;) he got it last year.

  55. I’ll be buying a 4s this coming June 2012

  56. iPhone4. last yr

  57. Actually i don’t own one, but if i win i’ll give it to my sister-in-law, she bought it i think last 2010.

  58. I am planning to buy an Iphone 4s this coming June and I really want this case for my first ever Iphone. Hope I win. Thanks.

  59. im still enjoying my 3gs, btw last month globe offer me a 1500/month for a 4s tumangi aq hehe even i pay 3+++/month. i want 6 no matter how much it cost so im the one again past to iphone5.

  60. My sister have an iPhone4,she had it since 2010.

  61. I don’t have one but my girlfriend does. She just bought it earlier :)

  62. I have an iPhone4. I got it last year. :)

  63. iPhone 4 got it on November 2011

  64. I got iPhone4s since Feb.

  65. 4s, got it last month

  66. 4s, got it last month :0

  67. i dont have one but my son has, its a 4s

  68. iPhone 4s last week :)

  69. iphone 4s. Dec 2011

  70. nice design:)

  71. planning to buy iphone 4

  72. iphone 3g. got it for my bday!

  73. Got the original iphone. Got it 2 years ago.

  74. Dont have one, but my sis have! This wll be a great gift for her.

  75. iphone 4. last year…

  76. I want to win!

  77. An Iphone 4, December 2011

  78. I got one but a different brand (china) and way cheaper. It 1900 mah and slimmer. It does what it says so no complain at all.

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