The CL-18650-29E/1S2P is a rechargeable lithium-ion battery pack made by Cellevia. It consists of two 18650 lithium-ion cells connected in series, providing a nominal voltage of 7.4 V and a nominal capacity of 2900 mAh. The battery is encased in a hard plastic case, measures 79.3 x 64.3 x 34.2 mm, and weighs approximately 137 g. It is designed for use in applications such as GPS systems, digital cameras, toys, and medical devices. The pack also has safety features and built-in protection circuits to protect against overcharge, over discharge, and short circuit.