The battery inside the Armadillo Tracker is a rechargeable LiFePO4 battery pack custom-made for Houston Radar. It is not available off-the-shelf and must be replaced by Houston Radar authorized service centers. Please contact support@houston-radar.com and request an RMA to have the battery replaced in your Tracker. A quote or sales order will be sent along with an RMA number and return instructions. The battery capacity will be measured. If the battery capacity is less than 85%, we will proceed with battery replacement. If it is above 85%, we will tell you the battery capacity and let you decide whether to proceed with the replacement or not.