Tenergy CR2 3V Lithium Battery Non-Rechargeable PTC Protected High Performance CR2 Batteries for Flashlight, Digital Cameras, Toys, Alarm Systems, 20 Pack

Customers find these batteries offer excellent value and perform well in various devices, particularly in smoke alarms and smart home sensors. The battery life receives mixed feedback - while some say they last a long time, others report they die in less than a week. Power delivery also gets mixed reviews, with some praising its steady output while others find it insufficient.