BT189 Battery Tester Quick, supply testing: The BT189 Battery Tester with a definition LCD display enables rapid and accurate testing of various battery types without the need for an external power source. Portable and compact: Its small, lightweight design makes it easy to carry and use anywhere, ideal for onthego testing. It is suitable for testing button cell batteries and universal batteries. Broad compatibility and efficient testing: Tests a range of batteries including AA and AAA button cells. No power supply is required, and the device provides a reliable power indicator for household batteries. It is designed to support testing across a wide variety of battery types with its universal compatibility. Clear definition display: The definition LCD display ensures clear, accurate readings for efficient battery testing across supported types. Practical use scenarios: At home: quickly check remotes, toys, flashlights, and other household devices to determine if batteries should be replaced. On the go: verify battery status for travel, commuting, or outdoor activities to avoid unexpected power loss. In a small workshop: routinely test devices that use multiple battery types to ensure proper operation and planning for replacements.