This is a compact and waterproof external battery. It has one port and is rated as 3000 mAh. Since some power during charging is lost to inefficiencies (such as heat) it will provide approximately 2250 mAh. I was able charge my phone with 3800mAh extended battery from low levels to slight above 50%.
This battery has a light which indicates when the battery is charging or being charged, but it does not have a charge level indicator. If the battery is almost exhausted I will not know this until the light goes out and stops charging.
I tested the port with a current monitor and it delivers 1A. Which means it a bit underpowered for Apple devices. It charged my iPad Mini but slowly. It was faster charging my Nexus phone but not at the optimal speed. If you are interested in the details of the next I am including them below in the "test results" section.
This battery's size is 4"L x 1", its weight is 2.5 oz.
The package included the battery itself, a micro USB charging cable and an instruction sheet.
Test results:
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I use the current monitor to test all my chargers. This gives me a numerical way to compare different external batteries to each other so I can tell different chargers perform relative to their peers. For each test I use the phone and tablet, same cables, and I start each test at the same level to account for non-linear charging.
iPad Mini:______________0.93A / 4.90V_________(optimal rate is 1.60A / 5.00V)
Nexus Samsung phone:____0.86A / 4.89V_________(optimal rate is 1.00A / 5.00V)
Because this externally battery pack is small and light and did not charge my phone at the optimal speed I am using it with my Sansa MP3 player. Sansa has a built-in battery and I typically listen to it attached to a small external charger this way it never runs out of juice. This battery is working very well in this role.
You can find it on Amazon by following this link.
Ali Julia review ★★★★☆
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