After an extended interval collecting the bits for the LiFePO4 dual-battery system I’m installing in our Troopy, I’m finally buttoning up the project, which will appear first in OutdoorX4. The delay gave me a chance to experience in a small way one of the benefits of LiFePO4 batteries, which is their superior voltage stability when left idle. I received this battery from AntiGravity in early February, and it has sat since then. Upon installing it I checked the voltage before starting the engine, with the result here. That’s impressive.