Milwaukee 48-11-2401 M12 RED LITHIUM 12-Volt Lithium-ion Cordless Tool Battery

All 6 - yes 6! - of my original M12 batteries failed within several months to over a year after purchase and would not charge. I finally took them to the Milwaukee repair center as I knew they were warranted for 2 years. I took my receipts but they didn't even look at them. Popped them in a charger-and sure enough-bad. They replaced them all on the spot with no questions asked! I would recommend Milwaukee to anyone. I am hopeful that the new ones last like my other tools (including Bosch, Makita and DeWalt) and I will post an update if I have more problems-so far, so good-hopefully they have fixed whatever was causing failure. Go get yours replaced if they have failed. If you don't have a receipt, they can use the serial number for warranty. Hope this helps.

Milwaukee fails at quality control on this product, and doesn't seem to care either way.
I've had 2 in 5 batteries fail within a year, and even a third delivered defective. With a 60% probable failure rate, they may want to consider the value of China as a country with very cheap unskilled labor.
Thank you.

Update: Checked on warranty replacement. The closest Service Center is over 30 miles each way, and stated no guarantee of replacement
:( >>Disappointing for the Milwaukee name brand.

I bought several of these tools last year and all but 1 battery would not charge after modest use. What worked for me was to discharge the batteries completely (I used the flashlight) until it is just a dim glow, and then recharge. Several of the batteries that gave me the flashing red/green indication returned to proper operation, charging to green and giving me 4 LED's on the tool. Maybe this is a cell balancing issue. If the battery is right, with a good charge, I can use the screwdriver all day on a battery.