There are many ring devices with a rechargeable lithium battery, like video doorbells, doorbells 2 and 3, doorbell 3 plus, peephole cam, stick up cam battery, floodlight cam battery, and spotlight battery. Every
Ring and OnTech, for example, charge $65 to $215 per additional device, so you get a discount but you’ll still have to pay for each cam you install. Other vendors may charge the same installation fee per camera until a certain number is reached. For example, two cams may cost $200...