Review on Maximize Your Power Tools With Energup Upgraded 12V 3000MAh Lithium-Ion Battery For Milwaukee M12 - 2 Pack by Allan Ryser

After right at 1 year I started getting a flashing light on my charger. This is 1 of 4 batteries. Ordered them about 2 years ago and curiosity got to me, so I thought id try to figure out what caused the failure. This battery was in a very light use tool, Milwaukee M12 temperature gun when it died. Occasionally may have been cycled through a 3/8ths ratchet, but doubtful as the tools never really crossed paths. So it's not as if it was in a high load or use situation. Still not a terrible value for what you get I suppose.