I use the Arlo pro 2 unit battery charger but be careful tight squeeze and you may need screwdriver to prod them out once charged. To me they seem better constructed than the original Arlo batteries that came with our system. I also believe they hold the charge somewhat longer. Reason for 4 stars primarily due to my experience with them vs original batteries, one which was worthless in less than one year. Only disappointment so far has been tight fit in using the Arlo portable 2 unit charger.
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