I am looking for an emergency phone charger to charge an iPhone or other USB charged device. I have a dozen of 18650's and again good sets of AA Eneloops. I know there are many charger battery packs around but I wouldn't want to risk with cheap LiIons but use my Sanyos's and Samsungs instead.
I found 1xAA chargers too, but they look very weak and powerless.
Is there any charger that can accept 2-4xAA, 1x18650 or 2x18650s and output 5V 500mA-1A USB offline? Maybe a reliable 18650 LiION charger that can output 5V on battery power? I see some chargers with USB output but can't confirm if they give this output when they are plugged in only or using battery power.
Charging current is 500mA when connected to a computer USB port.
The charging current is 1000mA when it's connected through an adapter to the mains socket.
This device is portable and can be carried with ease. Provided that the charger has a 18650 or 26650 battery in the cradle, it can charge devices that can be charged by an USB connection, like cellphones, MP3 players, GPS devices and so on.
I ordered this one http://goo.gl/HeAJ1 , it should be the same as 2A version, I think it is better to buy very overrated things from China, because you never know if that 1A version could really deliver 1A :) 2A will be enough for raspberry pi and plugged in devices like camera, bluetooth/wifi, small screen...
Buying overrated products might get you bad products, see the 18650 4000mAh cells that actually have 1700mAh, but most cells rated 2200-2400 are exactly as advertised.
I buy only "good" batteries, but this chargers and usb adapters are different type of stuff, I think that 2A-2,5A version should really deliver two times more power if necessary than 1A verion :)
That ebay seller shipped it same day I ordered it (dec. 22 or 21), so probably I would receive it in 2 weeks.
I ordered 4x Sanyo 2600 batteries + ML102 charger from Intl-outdoor and now this 4x18650 mobile power supply too. I'm looking forward to any further recommendations that will cost me further :)
I have purchased no less than six of these they have proved to be invaluable lately with the extensive power failures we have been experiencing in the northeast the last couple years. We had a three day power failure during the Halloween Blizzard and I only had one in my possession at the time big mistake. The flashlight part works very well also for putting out a decent amount of flood and it doubles as a nightlight for unused USB ports. It has two setting .4 amps and 1 amp output for iPhones and various tablets. It comes with plenty of adapters and has a built in battery gauge. The only drawback is only short non protected batteries fit which is fine for me because I have 20 shorties but this may be a problem for others. I highly recommend this item.
I have a 1A 4x18650 version of above mentioned usb power source, and I tested it.
The output voltage is regulated a little above 5V (5.12V exacty), and it can hold the voltage up to 1.2A.
The cut off voltage of the cells somewhere 2.8-2.9V, so I can say that it is safe.
It has a charging circuit, and if you have a 5V 1-2A power supply with 5.5mm socket, you can charge the cells simple. The charging current is below 1A and it decreases through the charging process like the cheaper version of liion chargers, does not follow CC/CV method. A little slow, but it can charge the cells up to 4.17V and stops the charging at this point, as I measured.
Very usefull, I can use it for portable usb HDD (eg. weak PC usb port) etc.
Great to hear that. I ordered the 2.5 A version but I think the charge current should be controlled by the phone so shouldn’t be a problem. Are we right in this? Would you guys please confirm?
