Uses Mono-Crystalline silicon solar cells, with 2 Watt/220mA output. Need 3-4 hours to fully charge optional AAA batteries in a sunny day. It has built-in battery cabin where you can charge 5 AAA batteries (not included), and therefore can serve as a battery charger & emergency power source. The charger has a flashing (charging) green indicator, and battery full red indicator. There are three types of Solar Cells on the market. All our solar chargers use the best - Mono-Crystalline Solar Cells. Amorphous or Dual Junction Solar Glass are the cheapest but are only 7% energy efficient and have a 5 year service life. They are big and heavy. Poly-Crystalline have 25 or more years of service life under direct sunlight and are 13% efficient. Mono-Crystalline have 25 or more years of service life and are up to 20% efficient. This is the same type use in solar car racing or the solar airplane. This type of solar cells is now in worldwide shortage because only a few companies can manufacture this solar cells. This mini-charger is using the best Siemens mono-crystalline solar cells. It is currently in worldwide shortage and it is getting more expensive.
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