Ohmni’s batteries will last up to 4-5 hours in a call and around 8-10 hours on standby. The batteries charge at about the same rate that they discharge when the robot is turned off. So if the battery is half full, it will take about 3 hours to charge to full while turned off. For more information, feel free to take a look at our helpdesk article here: https://ohmnilabs.zendesk.com/hc/en-us/articles/360013211073-How-long-does-the-battery-last-and-how-long-does-it-take-to-recharge-