on light on dfr0559 does not light up despite connected to battery

I have connected a 3.7v 2500mah lipo battery, two 5v 200ma solar panel in series to the dfr0559. At first both on and charging light lit up but while running some tests on the motors, the system stopped. We first thought the battery was dead so we charged it and the charging light is on using solar panels and a micro usb. After charging overnight the on light never turned on, checked both voltages from the solar panel and the battery and is running normal. Switched the battery for a charged 800mah battery but the on light will still not turn on.