YES! This totally works, I've done it. I used to do it when I was a kid. I even attached a tiny solar panel from a Radio Shack kit to a toy once. I've replaced some of our batteries with rechargeables in recent years although I know those are ultimately destined for landfills too. I will be doing this from now on. I've certainly got plenty of chargers laying around. Thanks you. Keep up the good work.