Instapark® Mercury 4S Ultra-slim Portable Solar USB Cell Phone Charger with Built-in 2,000 mAh Rec

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.

I've had this his solar charger for a few months now and it charged my G2x Android phone just fine. It works better when you charge the device your charging while the panel is getting a direct charge from the sun. The quality of the unit is well built and folds nicely in a compact form.

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"Hello, I have a complaint about this product Mercury 4S Portable Solar and that's why I'm writing angrily this message. Please, you never buy this solar charger, never in your lives. I bought 10 Instapark® Mercury 4S solar chargers but none for them worked. These solar chargers neither charged their internal battery nor charged any cell phone's battery. Please, Keep in mind this advice "

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Delivered ahead of schedule. Impressive looking, rugged, good power rating, great size for backpacking just to name a few characteristics. Will take it on a good test run in a few days.

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