We bought a 0.5 watt solar panel with 4.5 V, a 4 AA battery holder and a 15 ampere Schottky diode 45V , and 4 lithium ion rechargeable batteries.
We connected the red positive solar wire to the diode. We assumed the end of the diode with the silver line is the cathode and connected that end to the solar red wire. We then connected the red wire on the battery holder to the opposite end of the diode that was black. The black wire on the battery holder was placed with the black end of the solar panel.
We placed it in the sun to charge but my daughter said it did NOT charge the 4 lithium batteries.
Please let me know where I went wrong.
Thanks so much for such a quick response! You engineers are amazing, kind and helpful people. This world would be a much better place with people like you in government....but I guess that's why you are engineers.
I heeded everyone's comments.
I still used the 0.5 watt solar panel with 4.5 V, a 4 AA battery holder and a 15 ampere Schottky diode 45 V, and changed to 4 Energizer Recharge Power Plus 2300 mAh NiMH AA. I changed the direction of the diode. Guess what!?! It worked. Thank you for all the warnings about the lithium CoO2/graphite Tenavolts 1.5V AA High-Capacity Rechargeable Batteries with 2775 mWh. Out of curiosity, because we used a 4.5V solar panel and the lithium batteries were 1.5Volts (x4) the total voltage need to charge would 6V solar panel. By using a solar panel that was less than the required voltage, would the batteries get charged but not to full capacity? Would that decrease the risk of fire? How does time of charging come into the equation?
Any books or websites recommendation that are not too esoteric that can explain this to my 12 year old daughter and me would be greatly appreciated.