Originally Posted by John_Deer
One reason I have never bought a red dot is many red dot's have a 3 hour battery life. All red dots use expensive hearing aid batteries. I would have to replace the battery every time I used a red dot.
Mine takes a CR2032 watch battery that costs $3 for 2 at radio shack or $9 for 20 on amazon. I've had it on steadily for a total of 12 hours this hunting season. I keep a spare taped inside the stock.
Most of the red dot sights I've looked at take the same battery mine does. Some of the aim points take DL13nbs that are about $5 a piece but advertised battery life is usually somewhere between 30,000-80,000 hours at the lowest brightness setting, depending on the model. The micro t-1 that a lot of guys buy takes the same battery mine does at advertised 50,000 hours.
Eotech's latest optic is advertised at 600 hours of battery life on its highest setting.
The only red dot sights that ever consistently had problems like you're talking about were the very old ones. If you have a new one dying after 3 hours, it's probably defective.