Comes with 3 freshly installed batteries and I'll throw in 2 back up batteries.

The Vintage Hewlett Packard 28C Graphing Calculator is a fully functional and reliable piece of technology with the trusted brand of HP. Made in the United States, this calculator is not only a collectible item but also a practical tool for solving complex mathematical equations. With three new batteries, this calculator is ready to work for years to come, making it a valuable addition to any vintage electronics collection.