Because I built for reliability, I invested about $2000 in a battery management system (BMS). It includes a "smart" charger (the PFC-20) and regulators that monitor the state of each battery, communicating with the charger when unusual conditions occur. This system keeps the charger from damaging the batteries with improper charging (especially overcharging).
But everything needs to be set up and calibrated to work properly. And I'm having problems accomplishing that.
Maybe it's because of a dumb operator, but I'm blaming it on dumb batteries. Read the rest of this (very long) entry to see what I've been doing for the past three months now.