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  • Third Rail Trio Slim Protective Case and Fuel Universal Rechargeable External Smart Battery Combo Kit for iPhone 4 and 4S
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Third Rail Trio Slim Protective Case and Fuel Universal Rechargeable External Smart Battery Combo Kit for iPhone 4 and 4S


List Price: $89.99
Price: $39.99 & FREE Shipping. Details
You Save: $50.00 (56%)
In Stock.
Sold by TheBestInClass and Fulfilled by Amazon. Gift-wrap available.
  • Thinnest battery-enabled case on the market
  • Universal Smart Battery slides onto case when you need extra power, slides off when you don't
  • The Smart Battery can function as a standalone backup battery to power the phone or other devices via USB adapter (included)
  • Smart Battery is compatible with all existing and future Third Rail cases - use the same battery even when changing devices
  • Easy-to-read indicator lights let you check the battery level of the Smart Battery with the touch of a button
  • Battery life will vary based on usage
  • Contrary to bulky traditional power cases, in conjunction with any Third Rail Case, the Smart Battery can slide onto case when you need power and slides off when you don't
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4 new from $39.99 4 used from $13.00

Frequently Bought Together

Third Rail Trio Slim Protective Case and Fuel Universal Rechargeable External Smart Battery Combo Kit for iPhone 4 and 4S + Third Rail Fuel Universal Rechargeable External Smart Battery for iPhone, Smartphones, iPad and Tablets
Price for both: $99.98

Buy the selected items together

Special Offers and Product Promotions

  • Buy Used and Save: Buy a Used "Third Rail Trio Slim Protective Case and Fuel Univ..." and save 85% off the $89.99 list price. Buy with confidence as the condition of this item and its timely delivery are guaranteed under the "Amazon A-to-z Guarantee". See all Used offers.

Technical Details

  • Size (LWH): 5 inches, 0.8 inches, 2.4 inches
  • Weight: 2.24 ounces
  See more technical details

Product Details

  • Product Dimensions: 5 x 0.8 x 2.4 inches ; 2.2 ounces
  • Shipping Weight: 8 ounces (View shipping rates and policies)
  • Shipping: Currently, item can be shipped only within the U.S.
  • ASIN: B0050SHBRM
  • Item model number: TRL1B1C
  • Average Customer Review: 3.9 out of 5 stars  See all reviews (51 customer reviews)
  • Amazon Best Sellers Rank: #185,503 in Cell Phones & Accessories (See Top 100 in Cell Phones & Accessories)
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Product Description

From the Manufacturer

Providing the ultimate 3-in-1 mobile solution, the first of its kind Third Rail System features a super slim protective case, a convenient and optional power case when needed, and a universal external charger for 100s of other devices. Contrary to bulky traditional power cases, the System lets you decide when/where/how to add on-the-go power. This may be the only mobile charger you ever need.

Third Rail System
The Slim Case is the thinnest battery enabled case on the market

Third Rail System
Traditional power cases add bulk, even when you don't need the extra power

Ultimate Flexibility

Daily power use may vary and your solution should vary with it. Contrary to bulky power cases without removable batteries, with the Third Rail System you have the flexibility to add additional power only when you need it. Have another device that needs charge? The Smart Battery also doubles as a backup battery for hundreds of other devices.

Third Rail System
An everyday protective case with a slide-on Smart Battery for extra power. View larger

Third Rail System
Durable hard-shell protection with access to all iPhone 4/4S features. View larger

Unlimited Power

On those extra long days, don't fall victim to the limitations of ordinary power cases, the Third Rail System gives you the ability to swap on and off multiple batteries (sold separately) for longer periods away from outlets.

Share your Power

Feeling generous? The Third Rail Slim Case is compatible with all Third Rail Smart Batteries so you can easily share Smart Batteries among family, friends, and coworkers.

Complete Coverage

Durable hard-shell protection with a soft touch coating provides access to all iPhone 4/4S features. The soft touch finish also helps prevent the phone from slipping out of pockets--a major cause of lost or damaged iPhones.

Power Hub

Using one outlet, you can charge both your iPhone and your Smart Battery. Simply plug the included Micro-USB cord into the USB port on the Slim Case, attach a Smart Battery and charge on. You can even charge other devices (i.e. Bluetooth headset) via the USB-out on the Smart Battery using the same outlet to create the ultimate power hub.

Future Proof

The Smart Battery will work with all future Third Rail cases. So, as you upgrade devices, you just pick up the appropriate Third Rail Case and continue to use your Smart Batteries--good for the environment and great for your wallet.

Universal Power Solution

In addition to charging your iPhone 4/4S, the Third Rail Smart Battery also doubles as a universal charger for hundreds of other devices such as smartphones, Bluetooth headsets, MP3 players, gaming devices, and Mi-Fi Cards.

"Works with iPhone" Certification

The Third Rail System is officially certified as a "Works with iPhone" product. This ensures that 100% compatibility with your iPhone 4/4S.

Works with iPhone Certified

What's in the Box

Third Rail Slim Case for iPhone 4/4S, Smart Battery, Micro-USB cable, USB adapter, user's manual.

Third Rail System Comparison

Third Rail System
Easily swap on and off multiple batteries (sold separately) for longer charge periods
Third Rail System Power Cases with Non-Removable Battery
Yes Multi-use and flexible solution No No user flexibility
Yes Add battery for on-the-go power No Cannot remove battery between uses
Yes Battery can be used to charge hundreds of devices No Only charges iPhone 4/4S
Yes Smart Batteries are compatible with all future Third Rail cases No Model Specific--have to scrap entire solution with each new phone purchase
Yes Batteries can be shared with other users No Can't share battery with others
Yes Fore longer use, swap dead batteries for charged ones No When battery dies, users are left with a useless brick
Yes One plug power hub charging for multiple batteries and devices at once No No power hub capability--limited to charging only the battery and iPhone 4/4S

Product Description

Third Rail Slim Case and Removable Battery for iPhone 4 and 4S


Customer Questions & Answers

Customer Reviews

This 3rd rail battery case system is exactly what I needed!
Hockey Mom
I preferred the iPhone functionality, but really needed the ability to go extra innings without being tied down to a wall charger or carry around a bulky battery case.
James Scobey
It doesn't even come close to giving me a full iPhone charge.
chazer

Most Helpful Customer Reviews

11 of 13 people found the following review helpful By Phil28 on September 10, 2011
I bought this when it first came out and I love it. It's the first case I've kept on my iPhone for months at a time. It allows me to use my iPhone from early morning to night while using my personal hotspot an hour or two each day. Normally the personal hot spot drains power rapidly and I used it very sparingly.

I've found the product has numerous benefits. If I forget to charge my phone overnight and it's dead in the am, I snap on the battery and when I get to the office it's charged. This week when we had a power blackout in San Diego and my cable's Internet service was out, so I used my iPhone as my connection to the Internet to monitor the news.

With regard to another comment, I use a MacBook Pro and sync it without any problems. This is one of those products that has to be tried to be appreciated. The convenience and the fact I never worry about my iPhone battery gauge any longer is why I recommend this wholeheartedly. I purchased an extra battery as well. The 2 batteries and iPhone can all be charged with a single adapter by snapping all 3 items together like Lego blocks. This is a well-conceived and clever product that works well.
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4 of 4 people found the following review helpful By zack on November 24, 2012
bought this, used for three days, returned due to design flaws:

A. every time you wipe the camera lens to take a photo, the top of the case falls off. this is unacceptable.
B. separable battery is fairly easily bumped off of case
C. design is not very sleek. very 80's boxy feel, in a bad way
D. no face protection for phone.
E. adapter difficult to fit into phone or battery in bad light - not easy to navigate.
F. am unsure just how much the battery extended phone life even when fully charged

I'm hard on my phone. also, I shoot photos CONSTANTLY. the fact that the top (non electric) section of the case falls off every time you clean the lens is an absolute no go, for me.

(four days later) just bought the iBattz Mojo Armor Removable Battery Case for iPhone 4 and 4S Black 1700mAhX2 fits all version of iPhone 4S/4 and am MUCH MORE impressed with it: it's half the price, doubled the run time of my Iphone4 per charge, has the protection of an otterbox and comes packaged with TWO additional batteries not one, plus since the batteries are standard you can buy additional batteries cheaply, for about $15 not $70ish. don't get the third rail trio - get the iBattz Mojo Armor Removable Battery Case for iPhone 4 and 4S Black 1700mAhX2 fits all version of iPhone 4S/4
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3 of 3 people found the following review helpful By John on April 2, 2013
Verified Purchase
Got two batteries and both worked great for three months. Then one would not hold a charge, then a week later the second one stopped holding a charge.
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4 of 5 people found the following review helpful By James Scobey on June 23, 2012
Verified Purchase
I've tried a number of extended battery cases for the several generations of the iPhone I've owned. It's not that the iPhone's battery life isn't great (it is), it's that I use it a lot and I need additional battery life as a fall back, occasionally, particularly when I'm mobile. My biggest issues with all of these cases is that they a) generally look pretty goofy and b) they add way too much bulk to the iPhone's slim design.

Enter This Rail's Slim Case and removable battery system. The idea here isn't an overly complicated one: you keep the case on your iPhone all the time and clip on an external battery only when you need it. This simple idea is fantastically executed in this case.

First: the basics. This case does a great job of not hindering any of the iPhone's controls. An issue I've had with several battery cases is their thickness: the case is so thick that it makes the buttons and switches on the iPhone too recessed to access easily. Not so, here. The volume buttons and mute rocker are completely exposed. The headphone jack and power button are slightly recessed, but very slightly, and to a degree I don't find onerous. The front of the case is perfectly flush with the front of the iPhone, so the home button access is not affected at all. The camera lens and flash are slightly recessed, which is good for protection, and it doesn't change the functionality of the camera at all. The finish on the case is a nice (not uncommon) matte finish that adds to your ability to grip the iPhone during use. There are openings to allow sound from the iPhone speakers out, and I've found that there is no significant impact on the volume output as a result.
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1 of 1 people found the following review helpful By runforfun on October 9, 2013
Verified Purchase
At first I thought that this was a great product. I use my iphone as a gps on my bicycle and having the battery clicked on the back worked great on long rides that drained the battery quickly. I also kept a charged battery in the car and simply clicked the iphone onto the battery when using the iphone as a gps (worked great while travelling). After one month, the battery quit charging the phone when it was clicked onto the case. The battery still had a full charge and still charges the iphone when plugged into the battery using usb cables but that defeats the whole purpose for me. I could have simply bought some less expensive rechargeable battery and plugged the phone into it using cables. - now I will need to run a usb cable to my iphone when riding in order to keep my iphone charged. I think this was a good idea while is was functioning.
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