I bought a tail light with 9 LEDs and laser lane markers for $10. It lasted two rides.

Luckily, I was able to fix it. Poor design or qc caused the battery connection to break. I re-soldered it using a piece of jumper wire between the battery and board.

Besides that, the rechargeable battery looks to be very low quality.

Other than that, it's a great light. Super bright. For ten bucks, it's worth the risk. But I wouldn't want to go much higher than that.