App note from NXP Semiconductors on their Arm Cortex-M0+ based low cost MCU LPC865 smart battery charger. Link here (PDF)
The application of batteries is everywhere: smartphones, notebook computers, wearable devices, handheld electronic products, smart small appliances, and so on. Information about the state of batteries is important for the user, for example, the battery temperature, voltage, current, capacity, how much time is needed to charge the battery and to get it depleted. It is important to ensure the safety of battery charging and provide a smooth and controllable charging curve. The abovementioned requirements are expected to be realized by a smart charger. A smart charging solution implemented with LPC865 is recommended.