Lithium battery in power supply

Solution
Actually, it does: "Lithium battery weight 7g". I can only think it got in there by accident. Why would a PSU have a Lithium battery and why would you worry what it weighed?




Okay, i too doubted that it could be a mistake. but such mistakes confuses the buyers and creates more doubts about the rest of the product description. thanks for the reply
 
Oops! My mistake. My dyslexia strikes again!
It's an error. PSU has no need of a lithium battery. A UPS yes, but not a PSU.

It doesn't mention lithium battery on manufacturer's web page and they should know their own products better than the retail supplier. That's where you need to look in future when you see something in the product info that puzzles you on a vendor's website.
 

Thanks for the reply