We have not had these batteries very long but so far they are great. Have used them in to listen to the news with my Roku on the remote headset and so far so good. We were using NiMH batteries but after a short time, they would start failing. These batteries are the same price as the nimNiMH h, and they charge so fast. The 1000 charge cycles with still a lot of capacity left, will not need to replace these for a while, do have to buy more for the rest of my devices.
I would not use these for electric door locks, smoke detectors, or any other device you when the battery gets low you know it. These batteries go from working at what seems 100%, to not working at all because of the safety circuits for the lithium cell.
Update 1/04/2020: We are still using these batteries with no issues, life is still as long as the day we bought them.
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