I purchased this in March, 2020. It tested out fine at the time, and then I put it in my laptop bag, waiting for my aging Lenovo battery to give up the ghost. More than a year later, that battery is still doing OK-ish, but I decided to check the status of this DTK battery.Dead.Well, not all the way dead, but shortly after hitting the power button, the laptop flashed "Critical battery level" and shut down. I've had batteries be outside of a laptop for many months with only minor discharge, so thiSee full review