Keep recording with motion

Is there any way to keep recording video while there is motion? I have a battery operated doorbell. It does no good to be able to see someone walking up to your door (30 seconds) and then have no idea what they do after. That defeats the whole puurpose of the device! I have an extra battery so preserving power isnt a concern of mine. It would be like having a cellphone that only gives you 30 seconds of use at a time. Dont treat your customers like they are idiots, give them control over their devices.