Instapark® Mercury 4S Ultra-slim Portable Solar USB Cell Phone Charger with Built-in 2,000 mAh Rechargeable Battery Pack for Apple iPhone (all generations) & other smart phones, Camouflage

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Price: $32.95    

Product Feature

• 4 Watts high-efficiency mono-crystalline solar panel with foldable design offers excellent portability, ideal for emergency preparedness, backpacking, camping and other outdoor activities
• Built-in standard female USB port for directly plugging in iPhones, Android-based smart phones, Blackberry & other USB compatible mobile devices
• Charges built-in 2,000 mAh Rechargeable Battery Pack and external device at the same time
• Measures only 7 ¼ X 4 ½ X 1 ¼ inches and weighs 7.6 Oz
• Weather-resistant design, backed by 1-year manufacturer's warranty

Product Description

From the manufacturer

Converting virtually unlimited supply of solar power to much needed battery juice for your mobile devices such as an iPhone, android-based smart phones, Blackberry and many, many more compatible USB portable devices while you are on the go or there is a power outage or disaster strikes, the Instapark Mercury 4S is a light and compact USB solar charging system that easily fits in your purse, messenger bag or backpack. Measuring 7 ¼ X 4 ½ X 1 ¼ inches when folded and weighing less than 8 oz, it combines two solar panels totaling 4 watts and folds up into a pack about the same size as a paperback book, but only thinner and lighter.

With a built-in 2,000 mAh rechargeable Li-ion battery pack for power storage and current stabilizing, the Mercury 4S is sophisticatedly designed and engineered and comes with standard USB port for directly plugging in your cell phones including all generations of iPhones, MP3 players, USB battery/power packs and many other USB compatible mobile devices. If your cell phone comes with a USB charging cord to connect to a computer, then that's all you will need to connect your phone to this USB solar charger, no other charging adapter needed.

Technical Specifications:

Power input: 4-watt Mono-crystalline solar panel
Power output: 5V Standard USB port
Maximum output current: 800 mA
Built-in battery capacity: 2,000 mAh
Operating temperature: 32 - 86 F (optimal)
Storage temperature: 32 -104 F (optimal)
Dimensions: 7 ¼ X 4 ½ X 1 ¼ inches (folded)
7 ¼ X 12 X ½ inches (unfolded)
Weight: 7.6 Oz
Warranty: 1-year

What's in the box:

Instapark Mercury 4S solar charger with built-in 2,000 mAh battery pack
User manual

Instapark® Mercury 4S Ultra-slim Portable Solar USB Cell Phone Charger with Built-in 2,000 mAh Rechargeable Battery Pack for Apple iPhone (all generations) & other smart phones, Camouflage Review

After reading great reviews of this on Outdoorgearlab, I bought this for a long bike trip I went on. The size and weight is excellent but it just didn't work reliably. I left it out in the direct sun on multiple attempts to charge. Although this should have charged my phone to full, I could only get 50% or less.

One of the problems is that there isn't enough feedback about the charge state of the battery. There is only one LED on the unit and their instruction manual says it turns from red to green when the battery gets 80% charged. You never really know how much charge is in there. Also, on a few occasions I charged it to green, took it out of the sun, then set it out to keep charging and it started over from red.

It did give my phone partial charges, so if you just need something to casually top off your phone while at the beach, it probably would work fine for you. However, for long trips where there is no access to electricity, reliability and consistency is important. I eventually returned this product. For my next trip, I'll probably try a more expensive panel from a different brand.

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