Important: .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 short positive, and negative contacts. .Never charge battery over 4.29V (another reason to use good battery charger). .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). .For best results (long life), charge the battery as soon as you know it is discharged.