A battery tester is a diagnostic tool that checks the health and remaining life of batteries by measuring their voltage and charge status. This tool is particularly valuable for automotive, industrial, and household batteries, helping users determine if a battery is still functional, needs recharging, or is due for replacement. Battery testers work by connecting the device’s probes to the battery terminals and then providing a reading that indicates the battery’s health.

Battery testers range from simple models that measure basic voltage levels to advanced testers that analyze the battery’s internal resistance and capacity. For car batteries, in particular, this tool can help prevent unexpected failures by identifying a weak battery before it becomes problematic. Battery testers are also beneficial in home settings for ensuring that batteries in essential devices like smoke alarms and remote controls are working as intended. The ability to assess battery health with ease makes this tool an asset in preventive maintenance for both personal and professional use.