I obtained a solar battery charger (like this one: http://www.walmart.com/ip/5000mAh-Portable-Shockproof-Waterproof-Solar-Charger-Battery-Panal-Double-USB-Power-Bank-for-Cell-Phone-MP3-Green/41475368 but not exactly this one, seems to be a Chinese imitation). I already charged up my phone with it, seems to be working fine. I want to use it as an external power supply to my Arduino Uno R3. I have built a project with it, wrote the code, tested it on my laptop, works flawlessly. The problem is not in the code or circuit.
The problems occurs when I connect my Arduino project to the battery (it has two 5V 1A outputs) It works for (as I've measured) 14~15 seconds, then the Arduino stops working (the LEDs are turned off) and the LEDs the battery has are also being turned off. It has a button next to them, when I press it, everything works for 15 seconds and then stops again.
Strangely, when I connect my Arduino to the laptop, it works fine and flawlessly. Connect it to the battery again - stops after 15 seconds. Every time.
I wonder what's the reason and how can I fix it? Is it because too much current is drawn? Why exactly 15 seconds?
Another thing, when I have both my phone and Arduino connected to the battery, everything works fine. Remove the phone, and it stops.
I would be very glad if anyone helps, it's a complete mystery to me.