Originally Posted By: Donald
Originally Posted By: JHZR2
7 years on a Liion battery that gets deeply discharged and run at high rates is not a bad life.
My FIL has one and has been happy with it.
You have to dissociate issues with battery chemistry, which are natural chemical aging mixed with user abuse, versus the quality of the tool.
Ask Boeing about Li-ion batteries and there 787 planes. They are tricky battery chemistry and you can get away with things in a cell plone battery that you cannot with a much larger one.
No kidding, Ive been spending the last many years working on this very problem for some very high performance systems.
Power tools typically use 18650 and 26650 cells which are ubiquitous and have failures as low as 10^7-10^8 when made by good manufacturers.
Aging of power tool batteries, again, as a chemical pheonomena, is more or less independent of manufacture, some additives and cooling approaches aside.
Large format (787, etc) is another story, and the manufacturing comes to play in it to a great extent, as do controls.