Originally Posted by Kontact

And yet, the Di2 batteries were damaged, Shimano did warranty them and the Shimano US tech reps gave the specific advice I've relayed to all of you:
DON'T CHARGE YOUR DI2 WITH A COMPUTER. USE A HIGH QUALITY BRICK LIKE ONE FROM AN IPHONE.

If you want to disregard that Shimano advice, have at it. But don't obscure it by saying that advice doesn't exist.