5 Best Solar Chargers for iPhone4S

GPS, smartphone, and video camera, those are many sportsmen won’t leave without. These technological tools have their benefits and applications, but only as long as they have power, especially for your iPhone. Below are top 5 solar chargers for your iPhone when you are outdoor.
1. Brunton Explorer2
The Explorer2 is a true go-anywhere solar charger. It weighs under a pound (14.8 ounces) and folds down to a compact 4.5 by 9.5 inches, but unfolds to 27.25 by 9.5 inches. If you’re going for a day hike with only a small pack, the unit will fit nicely. It charges directly but only has a USB output—fine for most handheld devices, but for larger items you’ll need a separate power system. The four solar panels increased the charge of the 4S by about 35 percent in one hour. Corner grommets allow the unit to be strapped down or hung up. At under $100, the Explorer2 is a great value.
Overall: ★ ★ ★ ★
Portability: A+
Durability: B
Chargeability: A-
Ease of Use: A+
Versatility: A-
Price/Value: A
Price: $96 / bruntonoutdoor.com
Final Word: Nothing flashy here, but you can get a ton of functionality from under $100.
2. Bushnell SolarWrap 250
The scroll-like SolarWrap 250 earns points for creativity. The paper-thin solar panel rolls up into a protective case that measures 9.5 by 2.5 inches (unfurled, it measures 9.5 by 15). The USB outlets are on the ends (under caps), so you can charge from the battery while on the move without risking damage to the panel. The SolarWrap doesn’t charge directly, but it packs a punch once the internal lithium ion battery is charged. That took all day, but then it brought the phone from 50 percent to full in one hour. The lightest unit in the test (9.5 ounces), the SolarWrap is a good choice for the backcountry.
Overall: ★ ★ ★ ½
Portability: A+
Durability: B
Chargeability: B
Ease of Use: A-
Versatility: B
Price/Value: A
Price: $70 / bushnell.com
Final Word: Easily the most innovative solar panel on the market. Lightweight and highly portable.
3. Gomadic SunVolt
Size matters. The SunVolt is large, which is both good and bad. At 13 by 12 inches, the panel is powerful but heavy (4.3 pounds). Given its size, you’d expect the SunVolt to charge rapidly, and it does. It took a half-charged iPhone 4S to a full charge in an hour. It’s so powerful that you can charge two devices at once. The bad news is that it’s too large to be considered for backpacking excursions. It comes in a carry case, which makes it easy to transport, and it conveniently folds so you can angle it toward the sun. There is no internal battery for nighttime charging, but you can buy one separately ($40).
Overall: ★ ★ ★ ½
Portability: B+
Durability: A-
Chargeability: A-
Ease of Use: A-
Versatility: C-
Price/Value: B+
Price: $100 / gomadic.com 
Final Word: Big and beefy, this unit will serve you best in car-camping scenarios.
4. Goal Zero Nomad 13
The Nomad 13 is sort of an in-between solar charger. At 26 ounces, and with folded dimensions of 10.5 by 7 inches, the unit is oversize for a backpack—it’d be a better choice for a base camp. It unfolds to 18.25 by 10.5 inches, and comes equipped with three attached connection cables. This ensures you won’t lose them, but also forces you to carry them even when they’re not needed. The unit will charge devices directly, but after leaving the phone plugged in for one hour, we saw only a slight increase in battery charge. It should be noted that Goal Zero recommends using one of its own battery packs, like the Guide 10 ($40), “for best results.”
Overall: ★ ★ ★ ½
Portability: B
Durability: B
Chargeability: C
Ease of Use: A
Versatility: A-
Price/Value: C
Price: $159 / goalzero.com
Final Word: An okay unit if you add on the company’s battery pack. Otherwise, its charging power is anemic.
5. EasyAcc 7W Foldable Solar Charger
This EasyAcc 7W portable foldable solar charger is has 2 lighting panels which effectively collect and make the best use of sunlight. 7 watt mono-crystalline up to 18% efficient solar array provides up to 5V / 1.4A total through one charging port. Besides, it is compatible with almost any smart device with an input of DC 5V including smartphones, PSP, Bluetooth speakers & headphones, Google Glass, and MP3 / MP4 players. Folded (size: 7.5 inch) and lightweight (weight: 12 oz.) design make it ultra-easy to use outdoor.

Overall: ★ ★ ★ ★
Portability: A
Durability: B
Chargeability: C
Ease of Use: A
Versatility: A-
Price/Value: A
Price: $26.99 / Amazon
Final Word: Super portable and easy-to-use unit for outdoor users.


Why most of USB cables are black and white?

First let me know “What is a USB cable?”
As what I mentioned, you may notice that it’s necessary to prepare a charger and a USB cable before charging a power bank 10400mAh. Read this article if you don’t know a lot about portable charger, here I will give a brief introduce about the USB charging cable/micro USB cable.
USB stands for Universal Serial Bus, it always means a digital data communication, which you can regard it as a data short-term travel from one device to another. Here, you should also know about the USB connector, a standard cable connection interface for personal computers and consumer electronics devices. So, what is USB cable? USB cables are long or short cables with USB ports to connect computers to peripheral devices.
Why most of USB cables are black and white?—Have you ever found that although USB cables colors are various, but most of the USB cables are black and white. Why?
Apple is a pioneer who use the white earphone/USB cables at the first. It says that they decided to make the earbuds & earbud cables recognizable. The early iPod ads all showed silhouetted people with bright white earbuds & earbud cables. And as a result, whenever you saw someone on the street with white earbuds/cables, you knew they were using an iPod — even though the actual device was in their pocket/bag, and even if they were, say, wearing a hoodie that hid the actual earbuds. To keep the Apple accessories stay the the same, they decide to produce white USB cable at the same time. With the big influence of iPhone, some competitors begin with white USB cables, too.
About the black USB cable, because most electronic devices are designed with black cables and it works as a convention which followed by most manufacturers. To be frankly, most of cables are black and I think what’s most relevant is that the black is always stand for classic and solid.


How to Buy the Right Smartphone?

1.Selecting a Smartphone Operating System
As smartphones have gotten smarter, they have also become quite similar. Just a few years ago, you could distinguish one smartphone platform from another based on specific features. Today's smartphones all arrive with access to their own app stores, wireless capabilities, built-in music and video players, and decent (if not excellent) cameras. It doesn't take long to become financially invested in a particular operating system's app ecosystem, so picking one that keeps you interested and happy is a choice best made correctly the first time.
Android is hackable, customizable, and it plays into power users' need to tinker. But Android also appeals to regular consumers; devices from HTC, Samsung, LG, Motorola, and Sony generally have large, beautiful displays perfect for Skype, texting, emailing, and reading eBooks. Dual-core processors mean top of the line models never lag or sputter, even when multitasking or playing games. Many Android devices have removable batteries and memory card slots, so expandability and longer battery life are possible.

Apple iOS
There were smartphones before the iPhone, but in 2007 this "iPod phone" was the device that truly ushered in the new era of mobile computing. By controlling the hardware and operating system, Apple set the stage for a rock solid touch-based device experience. Granted, it wasn't until 2008, when Apple introduced the App Store, that things really became interesting.
Currently you can opt for the 3.5" iPhone 4 or iPhone 4S, or the 4" iPhone 5. Each model comes in black or white with capacities ranging from 16 to 64GB. In other words, if you are looking for a large selection of phone styles this will not be your best option. But if you want a phone running a mature and stable operating system with a plethora of apps from which to choose, this is it. As a bonus, just about every cool new app developed will run on iOS before versions hit any other operating system.

BlackBerry 10
BlackBerry's BlackBerry 10 OS is newly built from the ground up. Older BlackBerry devices were primarily focused on voice calls and email; once apps took off, the company found that their previous platform was not up to the task. The result was an entirely new experience that still has a powerfully integrated messaging functionality (called The Hub), and it also runs apps well.
Windows Phone
Like BlackBerry, Windows Phone 8 is a ground-up rebuild. This operating system has a unique flow; screens slide into one another, and the home screen has Live Tiles to give immediate updates on everything from the weather to social media. Apps are becoming more plentiful, but there are still Android and iOS titles that might be missed by those who switch. Integrated Xbox Live is just one point of interest; Kid's Corner, Rooms, mobile Office apps, and automated backups to SkyDrive are also features Windows Phone 8 users will enjoy.

2.Determine your price range.
iOS phones (iPhones) are typically more expensive than their Android counterparts. Among phone manufacturers, Apple and Samsung are typically among the most expensive (with models ranging from $400-$700 retail), while HTC, LG, and Motorola tend to produce lower cost options (some low end smartphones can be acquired for under $100).
Phones are subsidized when purchased along with a phone carrier contract or sometime even "free" upon signing. This usually commits you to a 2-year billing plan for the carrier and includes penalties for early cancellation.
Some carriers also charge a monthly ‘device fee’ to make up for little or no upfront cost on your smartphone.

3.Pick a carrier.
Most carriers will offer a range of phone options across operating systems (no OS is specific to a carrier). Major carriers often subsidize phones or offer different payment plans and contract combinations to reduce the up-front cost of smartphones.
Some carriers, like T-Mobile, allow you to forego a contract while paying off the phone as part of your monthly costs. Cancelling your service early will force you to pay the remainder of the phone’s costs at once.
Unlocked phones are phones purchased outside of a carrier and thus not linked with a phone service contract. They are more expensive but allow you much more flexibility if you ever need to switch phone carriers.
If buying an unlocked phone, make sure to doublecheck that the model is compatible with your specific carrier’s network. Most carriers have a webpage where you can check compatibility with your phone model's ID information, (for instance Verizon, or AT&T).

4.Pick a phone service and data plan that works for you.
Phone service carriers will usually offer a wide range of prepaid monthly plan options for phone minutes, texts, and data over the cellular network.
You may be able to cut monthly costs by not purchasing a data plan at all, but this means you won't be able to access the internet from your phone if not on wifi.

5.Pick a screen size.
Screen size is measured corner to corner diagonally. Ultimately, screen size is a matter of preference. Smaller screen phones may fit better in your pocket and are often cheaper. Larger displays may be preferable if you plan to watch a lot of videos.
iPhone offers the “SE” series for compact phones and the “Plus” series for an extra large screen.
Android phones come in a wide range of sizes: there are smaller budget models such as Moto G or Galaxy S Mini, higher end models like the Galaxy S or the HTC One series, and oversized models like Galaxy Note or Nexus 6P.
Nokia offers Windows phone models ranging from 4-6 inch screens.

6.Check the storage space.
A phone's storage (usually listed in gigabytes or GB) is a measure of how many files (photos, videos, apps) it can store at any one time. Storage space strongly affects the price of the smartphone so consider how much you're likely to need before settling on a phone model.For example, storage space is the only difference between a 16GB iPhone 6 and 32GB iPhone 6,16GB is estimated to hold about 10,000 pictures or 4000 songs -- but keep in mind that your phone storage must also accommodate all your downloaded apps. Some Android phones (but not all) support storage expansion with the purchase of a microSD card. iPhones do not support storage expansion after purchase.

7.Consider camera quality. Although smartphones are known for taking high-quality photos in general, actual picture quality will vary quite a bit between brands and models. The best way to measure camera quality in a phone is to search for sample pictures online taken with that smartphone model or to demo the camera yourself.While manufacturers often advertise a camera's megapixel count, features like ISO, low-light performance, brightness, and noise reduction are equally if not more important to consider.Most modern smartphones come equipped with front and rear-facing cameras and flash, and will support third party add-ons (such as lens attachments).iPhones are well known for their high quality camera hardware/software.The Lumia 1020 Windows Phone is designed specifically for heavy camera use.

8.Consider phone battery life.
Battery technology is improving steadily so newer phones tend to have longer battery life, however your usage habits are what really dictate how long the battery lasts. Talking on the phone, gaming, and using phones outside of wifi range will all drain a battery more quickly.Average smartphone battery life can range anywhere from 8-18 hours. Most flagship Android models will not support replaceable batteries. iPhones do not support replaceable batteries on any model.Some newer Android phones utilize a quick charge technology to help recharge their large batteries faster (e.g. Samsung Galaxy S series or Motorola Droid Turbo series). Manufacturers claim phones with quick charge can achieve 50% charge in about 30 minutes.


What is the best brand in power banks for smartphones?

solar power bank /solar charger or waterproof poewr bank are best choice.
While no more words about how vital a power bank is for our mobile charging. And comparing with that, some buying tips seem to be more practical and useful.
Actually, here’re some basic guidelines on what kind power banks to buy. Surely, it, after all, depends on your individual needs and requrements.
If you have the habit of carrying too many devices while on travel, a high capacity power bank may be onto you; Of course, a low capacity portable charger would also be sufficient. Here are a few tips based on the major points:
Capacity: while choosing a right power bank, capacity is the foremost point you should consider. Power bank capacity refers to how much power is inside a power bank battery. Normally, it is measured in mAh or milliamps per hour. Noted that when charging a smart phone or tablet through a power bank, here will cause some power loss. So the real capacity of a power bank is about 70-75 percent of the battery capacity listed on the power bank. For example, a power bank with battery capacity at 10000mAh, while its real capacity may be in the range 7000mAh to 7500mAh. And this is for quality battery. If for downgraded battery, the loss of power is even more.
To meet ever-growing charging needs, many higher mAh units are available on the market now. But, keep your own usage in mind while wanna buy a power bank.
Connectors (or output ports): the number of connectors and the type of connectors matter. Regarding the type of connectors, Smart Charge and Quick Charge boost.
If you always forget to take along a charging cable, it would be more advisable to go for a power bank with built-in cable.
Smart Charge Features
Price: power banks with higher capacity while with a substantially lower price may not be genuine (Price of Best 20000mAh Power Bank). Pay attention, please. Most of them use refurbished battery which may not last long. Go for a power bank from a well known brand (Tips and Tricks: where to buy a reliable power bank), which, a bit expensive though, will keep your device safe.
Protective Circuitry: that will help you to better protect your device.
— Short Circuit Protection: to keep your power bank and the device safe when the short circuit problems happen.
— Over Charging Protection: to let the power bank cut off the power supply when your device is charged fully.
— Temperature Protection: to protect your device from overheating while charging.
Certification: DO check for the UL certification of the device, ensuring that the power bank you have been buying meets all standard quality requirements.
More you can check :

Here i listed 6 power bank i like most:
1. Anker 2nd Gen Astro Mini 3200mAh Power Bank: Anker was founded in 2009, the brainchild of a group of friends working at Google. Fast forward a few years and we’re now the industry leader in mobile power. Anker is the first power bank brand in North America. This Anker 3200mAh power bank is for your basic charging needs. It is very compact and helps you use your smartphone in critical situations when you need to make or take an important call and your smartphone has run out of battery juice. This 3200mAh external battery can charge your Apple iPhone 6 or iPhone 5S/5C more than once, the Nexus 5 once, the Samsung Galaxy S5 0.8 times, Galaxy Note 3 0.7 times, HTC One M8 0.9 times and the iPad mini 0.5 times.
2. Lepow U-Stone Series 12000mAh Power Bank: This Lepow Brand power bank– Red Dot Award Winner for its unique and timeless design, Faster recharging speed of 2.1A for a quick 7 hour charge (please use a 2.1A wall charger). Great energy conversion – higher than 85% for better efficiency, Biodegradable packaging made from recycled materials. U-Stone Package includes the Lepow U-Stone, Micro USB flat cable, and user manual. Apple adapters-30 pin, lightening and wall charger not included.
3. Jackery 6000mAh Power Bank:Jackery Brand mobile battery chargers go the distance. From sports fans to students, moms to mountain climbers, Jackery empowers people on the go. The power bank has single USB charging slot, and it assures full protection from any charging malfunctioning. There are four different colors to match your iPhone: Black, gold, orange, and silver while writing this. Jackery Bar is the smallest portable external battery with 2.1A output designed for extending mobile device battery life. It includes a high-energy density, fast-charging, compact design, and smart safety protection circuit. Jackery delivers beautiful design at affordable prices along with great customer service. The Jackery Bar is often used with leading smartphones and tablets like Samsung Galaxy, Apple iPhone, Apple iPad, and more. Jackery® Bar Performance for iPhones: 200%-300% battery life, Input: 5V/1A, Input charging time: 6-8h via Standard USB or AC adapter (not included); Output: 5V/2.1A; Compact Size: 3.8 x 1.8 x 0.9 inches; Weight: 5.5 ounce; 18- month warranty.
Buy on Amazon In US: Jackery 6000mAh Power Bank
4. Zendure A2 6000mAh Power Bank: Zendure USA Inc. was founded in 2013 by Tom Haflinger and Bryan Liu. The company’s mission is to deliver top-quality consumer electronics that exceed consumer expectations using high-end materials, premiere product development partners and user-centric design. The pocket-friendly A2 is our smallest portable charger, but with super-high-density battery cells, it’ll keep your phone charged long after the day is done. The Zendure A2 6000mAh external battery is highly durable, compact and lightweight. This power bank also has an auto-on feature which starts charging your device automatically after connecting it.
Buy on Amazon In USn: Zendure A2 6000mAh Power Bank
5. EasyAcc 10000mAh Power Bank: EasyAcc Accessory exists to please not to trouble. To make it easy as it uses and looks, The EasyAcc 10000mAh external battery is compact and ultra slim. It is attractive and is available in 6 different colors. This 10000 mAh portable charger is capable of charging the Samsung Galaxy S5 2.5 times, iPhone 5S 4.5 times, iPhone 6 nearly 4 times, iPad Air nearly once, HTC One M8, Moto X and Nexus 5 nearly 3 times, LG G3 and Sony Xperia Z3 more than 2 times.
Buy on Amazon In US: EasyAcc 10000mAh Power Bank
6. RAVPower 3rd Gen Deluxe 16750mAh Power Bank: RAVPower has made numerous powerbanks or external battery packs with each version improving upon the other.
One of the most important things about RAVPower is their reputation and reliability. The RAVPower 16750mAh portable charger is capable of charging various devices like AppleiPhone 6, iPhone 6 Plus, Apple 5S/5C, iPad Air mini, Samsung Galaxy S5, Galaxy S4, Galaxy Note 4, Galaxy Note 3, Galaxy Tab 4 Pro, Google Nexus, HTC One (M8), LG G3, MOTO X, Sony Xperia etc.