The TLD5542-1CHG_SHIELD it is a battery charger shield compatible with Arduino UNO. It can charge up to 6 lithium cells at 5A. The shield can be powered either by a USB-PD adapter, or by a standard 12V power supply, and it can be configured as:• Battery charger• Adjustable voltage regulator• LED driverA graphical OLED 128x64 and 4 pushbuttons are present to set parameters and check the charge status. The TLD5542-1 it’s an LED driver, so the charge algorithm is completely implemented in the Arduino, therefore it is highly customizable.