Swarovski RB AX Visio BatterySwarovski RB AX Visio Battery for AX Visio Binoculars is a Li Ion 3000mAh type with 2 hours of constant use or 15 hours of standby. The time between charges varies due to screen brightness, use of identification or Live View functions, active WiFi connections, and ambient temperature. It takes 3. 5 hours to charge the battery from zero charge to 90% level and 5 hours to go from zero to 100%. One RB AX Visio battery is supplied with the AX Visio.