According to Ring, the battery should last six to 12 months with normal use. In addition, if you ever need to replace it, a new Ring rechargeable battery pack will only cost $20-$30. In terms of how long a Ring doorbell will last, it will depend on how often it is used and the weather conditions it is exposed to. Moreover, most doorbells alert you when the battery is low, so you can buy a new one before the old one runs out.