Here’s where I saw that.I’ve never heard of that. I’ve had mine for maybe three years now with no battery issues. I’ve worked them pretty hard mixing stuff concrete, mortar and grout too. I mixed 14 bags of quickrete a half a bag at a time for our basketball hoop because my corded drill was fried.
On the other hand I’ve got some Ryobi 40V lawn stuff and went through 3 batteries in 3 years.