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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The Opteka BP-SC4000 Ultra Thin Solar Powered Mobile Device Charger allows you to charge your mobile devices when a wall outlet or USB power source are not available. The BP-SC4000 contains a 4000mAh lithium-polymer power bank which charges up via solar energy or computer USB port, and features 10 mobile-device connecting tips, extension cable and USB port making the BP-SC4000 compatible with most Nokia, Samsung, LG, Palm, Blackberry, Apple iPhone, iPod, iPad, Motorola, Sony, Bluetooth, GPS, various digital cameras, PSP, various eBooks, tablets, Nintendo DS, Kindle, and other devices.
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)
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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.
5) You can pre-charge the battery in the Opteka BP-SC4000 by connecting a standard mini (not micro) USB cell phone charger into the connector on the side of the solar charger (the one marked "input"). (If you are going on a trip you might want to precharge the internal battery so you can charge your device before the sun comes up.)
Finally, a note about all solar chargers. Your device needs to be outside (not inside looking through a window or a screen) and pointed directly at the sun to charge. It will not charge properly under a light inside your house. It will not charge properly outside unless it is pointed at the sun.
Opteka may not use the instructions here unless they send me 5 free chargers.
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. Once the iPod was fully charged, the Opteka showed about half of its capacity remaining - enough to charge another device. (I was unable to test the XTG's battery capacity in this way since I didn't have the proper adapter, but I suspect, given it's smaller specified capacity, that the XTG would barely have enough juice to fully charge even one device.)
7. The Opteka has a conspicuous and intuitive LED display on the front that tells when it's charging, when it's discharging (i.e. charging an external device), and, at any given moment, how much charge remains in the onboard battery. (When charging an external device, you do have to remember to hold down the button for 3 seconds to begin the process. Also, to check the state of the battery when the unit is idle, press the same button briefly.) The XTG has a display that performs basically the same function, but is on the back of the unit and therefore not in view when the unit is "sunning".
8. At $25.07 through Amazon, the Opteka BP-SC4000 is almost $3 cheaper than the XTG - a clear tie-breaker.
Most recent customer reviews
Better to just buy the 10k MAH packs.