CR2025 lithium 3V battery. Non-rechargeable.

These High-Grade Lithium 3V “button batteries” are used in many items ranging from watches, calculators to toys and portable hand-held appliances.

KEEP OUT OF REACH OF CHILDREN

This product poses a serious health hazard if swallowed. If swallowed you must go to emergency immediately.
Swallowing can lead to chemical burns, perforation of soft tissue and death. Severe burns can occur within 2 hours of ingestion. Seek medical attention immediately.