The older arlo uses cr123 and it was included. I just got tired of buying new battery and just bought bunch of rechargeable cr123. Rechargeable does not last as long as alkaline version, but sure save money. I do not mount higher than 10' , so it is slightly easier to change up the recharge cr123s.
Regular battery ~1-3 mo
Rechargeable as low as 5 days (cold winter with heavy usage) to 1mo.
Sun and shade really sucks with arlo, but I do turn off the notification ring and let it just record on the driveway which is facing north.
The one facing south is amazing. Always sunlight and barely any false alarm.






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