Battery 13.2 Module is a 1500mAh high-capacity lithium battery expansion module in the M5Stack stacking module series. It’s high-quality material guaranteed with a delicate protection board. With higher protection voltage to prevent overcharging/over-discharging failures and to ensure the safety of operation. Supports for multiple battery modules stacked. This module is the best solution for adding an autonomous and stable power supply to your devices that require long-lasting energy sources.