The Makita BTC04 Portable Battery Checker (Model: 198038-8) is a reliable tool for testing Li-ion batteries with a capacity of 18V or 14.4V. Made in Japan, this battery checker does not include any batteries, making it convenient for on-the-go use. Powered by 4 AA batteries or a USB connection, this product is useful for ensuring the health of your batteries in various electronic devices. Makita, a trusted brand in the industry, guarantees quality and accuracy in this essential battery testing tool.