4pcs Panasonic CGR18650CH 3.6 Volt Li-ion Battery 2250 mAh

Important: Never completely discharge li-ion battery ( below 2.5V ).- Charge fully before first use.-- Never use force to install (insert) li-ion battery.-- Use only high quality battery chargers.-- Do not expose to heat.-- Do not charge battery over 4.25V -- Do not charge unattended.-- Do not store your li-ion batteries fully charged (for extended period of time). Store in cold and dry place at approximately 3.7V (storage charge).