It’s shocking that we found Solar Charger might have +/-1V ripple while supplying 5V DC from Li-Po battery.The ripple varies according to the load, most project might run OK, but having high potentiality that ADC applications might have unstable read or other unexpected errors.
External Charging Circuit for sp6641 does not meet requirement and caused huge ripple. Changed to AIC1896 and ripple is within 200mV
Solution: Please notify us (depot(at)seeedstudio.com) with Your order and address, and let us know if you like to A) ship you free fixed replacement or B) sell you the next generation charger with half price. (please help choose only one option if you bought multiple)
We are so sorry for such irresponsible Engineering! The next revision is planning. We would also revise it with better functionality.
It would be charging from AC(?-?, screw terminal) and DC (4.5-6.5V, JST 2 pin connector) supply.
It would be able to charge normal 3.7v Li-Po with up to 500mA
It would be output 5VDC to USB host
Please let us know if you have any suggestions too, we will send out the prototypes as usual. Thanks!