Hiya,
Ring’s answers really are poor at best and useless at worst aren’t they?!
I’ve recently bought a Ring alarm, a 7 piece kit plus one extra magnetic sensor to cover a third door. I also bought a Glass Break Sensor for my conservatory and an Outdoor Siren.
In general, setup and use is really good, and despite my notes below, I still think its the best of the bunch (which includes Yale, ERA etc.)
If there is a bug, then it’s the constant nagging to buy into the Protect Plus subscription. The app constantly nags for you to do this and nothing you do will ever stop it. You have a choice; put up with the annoying nagging or subscribe!
Subscribing in the UK gets you very little compared to the USA. It automatically calls 5 people in order to say the alarm is sounding, and you get video storage. You also get cellular backup in case your wifi goes down or you suffer a power outage.
And the customer support is dire! As you can see here, I think the guys are just bored of helping people and it shows in their responses.
As for your Siren question, I’ll try to answer, but questions I’ve asked haven’t been answered either, but I’ll do my best:
The Siren comes with 4 x D-Cell batteries installed. In “normal use” these batteries last up to 3 years. SO I would estimate it’s likely to be closer to 18 months to 2 years depending on how cold the winters are!
Adding a Ring rechargeable battery adds “Dawn to Dusk” where the Ring logo lights up at night. I cannot tell you how long the batteries last in this mode as that’s a question they cannot seem to answer. The D-Cells become a backup and would therefore likely last longer.
You can add a Solar Panel to the 2 power source (making it three) which keeps the Ring Rechargeable battery charged. I should imagine this could become almost constant power with no need to recharge the Ring battery.
Finally you can also Hardwire using the Ring Power Supply, but obviously this needs to be indoors and is likely going to need a hole drilling in the wall. This keeps the Rechargeable battery topped up constantly, I doubt you would ever need to touch the Siren again in its natural life.
All the battery levels and the state of the Hardwire can be monitored from the app.
Your specific question about how long with D-Cells and a fully charged rechargeable battery only is something Ring don’t seem to be able to answer.
If you have any other questions, I’m happy to try to help, but do bear in mind, I’m just a customer and not a Ring employee 