SW584 External Battery Not Charging iPhone 4S—Possible Compatibility or Cable Issue?

I bought a new external battery yesterday and I tried it on today. But it refuses to charge my iphone 4s. What should i do?

The battery has the same design style like this: http://www.external-battery.net/products/sw584-external-battery.htm

Thanks in advance!

Hi Huanqiu,
This device is a portable battery unit for recharging your phone, but you must charge this battery before it will charge your phone battery.

The unit appears to charge from a USB port, so you can charge it from any device which has a USB output port, such as a PC or laptop or mains USB charger.

It is like a petrol can for a car. You have to fill the petrol can before you can fill the car's fuel tank.

It is a 9000 mAh (9 Amp-hour) battery, and a normal USB port can output 0.5 Amps (500mA), so it will take about 18 hours to fully charge.
(It will automatically stop charging when full, and probably has a charge complete indicator light.)

If your phone battery is (perhaps) 1 Ah (1000 mAh), the unit will charge the phone fully (from fully discharged) about 9 times before the battery unit needs recharging. (Actually less due to only 90% system efficiency.)

Charge the battery unit first, then charge your phone from it, and let us know if there is still any problem.

Thank you you are an authoritative experts

Here you are

Try this tested works from a static 12 volt power supply tested and pre built and I know it works All pcb plots inside plus diagrams , plus parts list , plus proteus design files , plus pcb layout for you


Hope that helps

Heres a picture of it

You will have to case it with a decent case plus 4 inch by one inch heatsink

Image didnt upload for some reason Here it is again

I like to charge my iPhone 6 with external battery charger in the same way. But I show never met the trouble like you said. I have used 150w power inverter to charge phone for a long time. Just connect this power inverter with car cigarette lighter charger outlet, then I can charge phone in car. If you need to know more about this external battery charger, you can search bestekmall on Google. Wish this tip is helpful to you. Best regards.