Unfortunately, YUASA confirmed in an e-mail that they no longer carry their Battery Analyzer which was a steal at under $11.

Some of you may be familiar with them...

In a nutshell, it had multiple uses:
  • a press of the snap-action membrane switch lit up a Green (>12.5V) or red LED (<12.5V) to tell you the battery needed charging.
  • a charger with SAE connector could be hooked up.
  • it provided power to my heated clothing.

So I'm looking for another source.

The one from Save-A-Battery is useless since its voltage trip point is far too low at 12.2V.