1. Update the Bluetooth drivers on the computer. There may be an incompatibility from something else getting updated or settings may have been changed.
2. Related to #1, try a system restore to an earlier state. Since it was working before, you may be able to return Windows to the configuration that worked in the past.

Note: last time I used it was yesterday, it started blinking red, I was sure that it was for the battery shortage, so I recharged my batteries and put them back in, and since then this situation persists.

Note II: I have replaced the batteries with new ones nothing happened, and I am quite sure that something has went wrong in hardware point of view.
I love this device, I’d appreciate it if you could help me on the issue.

I had the same problem, flashing red light and tried everything listed here to no avail. I also noticed the mouse was manufactured in 2008 and is now 2012 which I thought was a bad battery.

The charger output is 1 volt but when i checked the battery voltage, it didnt read anything. Bought a pack of rechargeable’s from Amazon, same place I bought the mouse and problem solved.

Lucas.

Also note that if a battery is drained too far, a “smart” charger will perceive it as not being there at all. Try charging it partially with a cheap standalone charger and then put it back into the mouse to continue normal charging.

have been to this thread around a year ago and was happy to implement what is suggested here.
This seemed to work, but not as good as i would wish it did. Now i am still struggling with the damn mouse each time the battery needs recharging. it flashes green at once, but within a minute or so it suddenly starts flashing red and does this forever, without actually charging. The funny thing is that i actually like using the mouse and also the keyboard, so far the best input i have owned (i had several types of logitech, one of them is the one i am falling back to when the damn mouse gives me the red flash). actually this is what motivates me when i am not putting all my force when smashing the damn thing for it to start charging properly.
So my point here is that the problem doesn’t seem to be the electrical contact one. strange that this solves the issue for so many people, but for me this solution is not enough. i still makes it charge eventually, so i am repeating all of the actions below in an endless loop of rage:
– check the battery and the push down system (paper and some other material to absorb vibration)
– turn off/on
– say dirty words
– hit it hard on the top
– press firmly to the charging pad
– cry and please the goddess of all mouses
– tie to the charging pad with an elastic string
– go do smth else for a while
– plug in another mouse and put it right next to the M$ one

at some point, something of the above makes the mouse continue flashing green and then the best thing i can do is leave it alone and not even look at it.