- Weight: 1 pounds
Opteka BP-SC4000 Ultra Thin Solar Powered High Capacity (4000mAh) Backup Battery and Charger for Cell Phones, iPhone, iPod, and Most USB Powered Devices
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- Will fully charge your mobile device using solar or USB Power
- Ultra high capacity of 4000mAh
- Includes 10 charging tips with USB port to maximize compatibility
- LED power capacity display
- Auto-shutoff once charging is complete
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Battery Capacity:4000 mAh
Voltage:Output DC 5V 1000mA, Max Solar charge: 250mA
Dimensions:4.5" x 3.3" x 0.5" (114 x 84 x 14mm)
Weight:6.5 oz (185g)
Top Customer Reviews
On the plus side the charger, when exposed to direct sun light, (not indirect winter light) charges quickly and provides more than enough power to charge my Android phone every night.
On the negative side, if you don't figure out how to use the charger (and you won't from their instructions) you can't charge your device. Here's the owners manual they should have included:
1) When placed in direct sun light, the four LEDs at the bottom right of the device will flash from left to right. The rate at which they are flashing indicates the rate at which the internal battery is being charged. The faster they flash, the more power you are getting from the sun. Put the solar cells in direct sun light for maximum charge.
2) When the device is fully charged (although it does not have to be fully charged to attempt to charge your device) all the LEDs will go out.
3) While the battery is charging (and the LEDs are flashing) you can press the silver button quickly to see an indication of the internal power level of the battery. (1 LED = 1/4 charge, 2 = 1/2 charge, 3 = 3/4 charge, and *none) = fully charged)
4) To charge your device, plug it into the included USB adapter. If the solar LEDs were still flashing, charging of your device will begin immediately. If the LEDs were not flashing, hold the silver button down for 3 seconds to begin charging your device. When charging is complete the LED will go out.Read more ›
1. The specs for the Lithium-polymer battery on the Opteka BP-SC4000 claim 4000mAh capacity -almost three times the capacity of the battery on the XTG.
2. The maximum solar charge rate for the Opteka is spec'd at 250mA - more than twice the 120mA rate specified for the XTG. This should translate into significantly faster recharging of the Opteka's onboard battery for the same amount of draw-down. (Example: If your cell phone, during recharging, draws 1000ma, it will take about 4 hours of direct sun to replace the charge in the Opteka vs approx 8.5 hours for the XTG.)
3. The Opteka BP-SC4000 comes with a complete assortment of adapters to accomodate just about any small, USB-rated, battery-powered device. The XTG came with only a USB-to-mini-USB cord.
4. The workmanship on the XTG seems a bit shoddy, with noticeable gaps at the edges of the plastic sealant that coats the solar panel. The Opteka, by comparison, appears sturdy and well made.
5. The Opteka weighs about 7oz compared to 5oz for the smaller XTG (significant, perhaps, only to ounce-parsing backpackers like me). But those two extra ounces appear to translate into significantly better performance that is well worth the weight.
6. It took a little over an hour for the fully-charged Opteka to completely charge my iPod Touch.Read more ›
Here's how I conducted my test:
First, I make sure that the internal battery is fully charged from external USB adapter. Next, using the provided USB cable and plugs, I connected a 50W 5-ohm load resistor to the USB output. The load current I measured is 0.98A, and the output voltage is regulated at 4.85V. This gives an output power of 4.75W. I then timed how long it took for the converter to shut off. The last status indicator bar went out shortly after 158 minutes.
How does this runtime relate to the battery capacity?
The 5V output has to be boost-converted from the internal 3.7V battery. Assuming a typical conversion efficiency of 85%, the internal battery has to supply at least 1.51A (3.7V*1.51A*0.85 = 4.75W). A 4000mAh battery should then last for 4000mAh/1510mA = 2.65 hours, or 159 minutes.
So my test above proved that the battery capacity rating of '4000mAh' is right-on. However, in the process of this test, I also discovered a confusing behavior about the battery status bars...
There are four status bars for the battery indicator, with 4 bars being full and zero being empty. Naturally, people will assume that each status bar represent 25% of the capacity left. This is NOT the case. The status indicator is actually a non-linear representation of the battery capacity.Read more ›
Most Recent Customer Reviews
worked well a few times but after sitting it out in the sun to charge i guess it got to hot and stopped charging altogetherPublished 12 hours ago by chris
Fast shipping... Iv had it for over a year, still works Great...Published 15 hours ago by Eric Stephens
Works well, a bit disappointed it won't charge my phone right off the panel but does ok.Published 8 days ago by Ben
I used this charger in New Mexico on my back packing trip to keep my devices charged. I did enjoy this device for the most part and kept it attached to backpack to keep my devices... Read morePublished 13 days ago by Austin
Horrible. They are more of a novelty piece rather than a good charger.Published 1 month ago by Shane Dwyer