By a process of trail and error I worked out why my LED lights activated by motion sensors stopped working.
They worked fine for a few months. Replaced the batteries with rechargeable ones and the lights kept coming on even without any motion. They are designed to stay on for 20 secs and shut down if no motion detected. But the lamps would come back on immediately after 20 secs and keep doing this draining the batteries.
Changed the rechargeable batteries to normal ones and they are working fine.
No mention of this anywhere on the internet. So you heard it first here.
Any reason why they should do that?