What is the fine-grained topic of the following text: The Front-panel, plug-in Battery-pack of the M359-2 (P/N: M359380-1) uses the highest quality VLRA cells and its robust mechanical design allows it to safely tolerate the high level of Shipboard Shocks and Vibration that the M359-2 is designed for. Only return the topic.
The Battery-pack of the M359-2