Joined: Jun 2009
Posts: 2,243
Likes: 1,658
From: PacNW
Bikes: Dinucci Allez 2.0, Richard Sachs, Alex Singer, Serotta, Masi GC, Raleigh Pro Mk.1, Hetchins, etc
do you have a DVM ?
I suspect the red LED means the battery is open or shorted - some condition other than low voltage but charge-able
These DI2 chargers are pretty cryptic. and you're right - if you leave them sit, they will fail.
/markp