Brand new unused CR123a RCR123a 3.7V RECHARGEABLE 1 set of 4 batteries (photo shows 2 sets, but 1 set is already sold) I bought these CR123a RCR123a rechargeable batteries online for use with my security motion sensors and was pretty excited to receive them until I find that they are not compatible because the motion sensors can only use the 3V CR123a batteries, not 3.7V! Note: When you put 3.7V batteries into a 3V device such as motion detectors, they will become too sensitive and will not work. I was told that Arlo cameras are also compatible with these 3.7v CR123a RCR123a batteries. These batteries are charged directly with the supplied USB-C cables (1x USB-A at one end and 4x USB-C at the other end). You can use any USB charger to charge 4 batteries at a time. On the top of the battery there is a light that tells you the status of charging. Red during charge and Green when it is fully charged. I bought them online and cannot return them unfortunately. Same kind of battery sells for $38 + HST
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