Reddit mentions of Selectec Ultra-Slim 5000mah External Battery Pack Power Bank Charger for iPhone iPad Samsung LG HTC BLU Sony BlackBerry Nokia Google Nexus Motorola Surface Smartphone Tablet

So it's a basic 5000mAh lithium cell from a generic supplier, a 5V 2A out power controller with a small microcontroller that has BTLE, GPS, and WLAN built in attached to a reprogrammable NFC tag with some MMC storage and a Qi pad on the other side? That's totally achievable in that price point. Let's break some stuff down, shall we?

• 5000mAh packs are readily available from a number of outlets, and can be had in pretty thin sizes. With any decently stiff plastic backing (say a molded PC-ABS mix, for instance), it could be wrapped in leather pretty safely, especially with some kind of small metal insert for heat displacement.
  
• All "50% faster than a phone charger" means is 2A at 5V. I have several 3.3V to 5V output boosters capable of outputting 2A or above, and I can buy them individually for around $8-10. Getting them in bulk would reduce that price substantially.
  
• General wireless microcontrollers are cheap as dirt these days. You can get the raw chips for less than a buck buying in bulk, and a simple power routing board isn't much more expensive per-unit if you can put in a thousand or so orders. Firmware's already written and ready to go, too, so dev time is minimal.
  
• BTLE is an incredibly energy-efficient technology for devices implementing it properly. I could definitely see a microcontroller with no screen running for four months on a 5000mAh battery. You know the CMOS battery found on motherboards is only about 220mAH at 3.3V (works out to around 726mWh), right? The RTC attached to those is able to run for around six to ten years given correct conditions. Microcontrollers are a whole other world compared to the computers you're familiar with. For instance, a common power source for Arduino boards (the microcontrollers I have the most experience with) is a standard, blocky 9V battery, which weighs in at a whopping total 4.05Wh. In the right circumstances, you can run an Arduino Uno off one of these standard batteries for at least 38 days. Now, even if you're really cynical and quadruple the power needs of their theoretical specialized microcontroller, the battery they're using at the very least has around four to five times the capacity of a 9V (it depends if their 5000mAh figure is based on the cell voltage of 3-ish volts or if it's based on the power output circuit's voltage of 5, so there's a range there as a specification isn't given. Usually it's the lower number, but I've been surprised before), so in that scenario it'd get a month or so out of the battery. Given the BTLE specification calls for a maximum power draw of 15mA at the peak, regardless of voltage, the numbers I'm offering are pretty pessimistic, but hey, this is a quick rundown on a bullet point in an internet comment, not a lecture on how to get started with microcontrollers, so that's just the basics.
  
• NFC isn't expensive in the slightest to implement, reprogrammable tags are sold in bulk for a million different uses these days and can be had for pennies. Again, firmware on the microcontrollers are already geared up to handle tons of common implementations on the market, so dev time is effectively nil.
  
• Qi charger pads are, again, pennies, and, again, many work out of the box with a number of microcontrollers, no dev time needed.
  
• Cheap leather isn't expensive at all, so while the end product's finish may not be on par with high end dress shoes, there's totally genuine quality leather (genuine in this case being a grade of leather quality, the second lowest, and commonly used in cheap phone cases that cost only slightly above double digits on Amazon and other sites for resellers to move fresh-off-the-boat schlock direct to consumers with no marketing costs)
  
• MMC storage is continuously getting cheaper, and is cheaper than even MicroSDs are, as they have even less in the way of interfacing hardware and are basically just bare NAND storage chips soldered onto a board to be interfaced with directly by a microcontroller which, you guessed it, has the ability to read MMC already built straight into the firmware, so, again, no dev time needed.
  
  A huge additional positive sign: Maximums. Notice that every single tier has a maximum quantity that can be claimed? This means they know exactly how many units they have the capacity to make without being overwhelmed, and thus can avoid the typical problem successful hardware campaigns have of scaling up to meet a demand vastly higher than projected initially.
  
  Just because you personally don't see a use for a product doesn't mean it's instantly shitty and awful. I'll freely admit that comment you linked sounds an awful lot like it's astroturfed, but if that's your problem with the campaign, start with that. If you find their Eastern European names and domain registration with a campaign based in Newark suspect, lead with that. It has flexible funding rather than a set goal, definitely a red flag, so you could touch on that. But don't start with "oh here's a bunch of specifications that I think are impossible" if you're not familiar with how these kinds of things are manufactured. These things aren't tough to make. For shit's sake, produced at volume, third-shift factory workers can make a profit on entire freaking phones for fifteen bucks if they cheap out to the barest Chinesium. A hundred bucks for what effectively is a cheap power bank, phone microcontroller sans GSM circuitry and screen (two of the more expensive parts), and a Qi pad all wrapped in a two buck per-unit IM case with some leather glued on the outside isn't some impossible task. I wouldn't buy one, and I'd definitely be suspect of whatever fly-by-night lithium supplier they'd team up with, as that's one of the first places first-time hardware manufacturers cut corners on cost, but the price they're charging is an absolutely reasonable one. Depending on where they'd source parts, it could very well be pretty overpriced, actually.
  
  EDIT: Grammar, clarifications.