http://www.ikea.com/us/en/catalog/products/90154371 The product above from Ikea is a solar powered lamp. I am doing a project similar to this, using solar power to charge a battery. Can anyone guide me to what I need to know to build the circuit to charge NiMH batteries like the lamp from Ikea. The batteries are being charged and the lamps can still operate. From what I know, NiMH must be disconnected and placed into the charger to charge. So how can the batteries in the lamp get charged w/o removing it? I need a push in the right direction, totally clueless.