This document describes the specifications and discharge/charge characteristics of the BAYSUN Lithium-Ion battery pack PBT-BAT-0001. It has a capacity of 65Wh or 4400mAh, operates between 12.8-16.4V, and can be charged in 5 hours. The document compares the simulated and measured discharge curves of a single cell at rates of 0.2C, 0.5C and 1C, and shows the relationships between state of charge, voltage and charging current over time.