Rechargeable LiIon batteries Battery Pack APS2 are designed to be used with digital and thermal riflescopes Pulsar Thermion Digex etc. monoculars Axion APS3 binoculars Merger APS3 and to significantly increase their self contained operating time. Only use the charger supplied with the Battery Pack may not be included. The use of any other charger may irreparably damage the Battery Pack or the charger and may cause fire.