He shall see...
The "microprocessor" retails for $1.21 in (10) lots.
BUT! This subject actually helped me see something related to charging but in a different vein. I was going nuts trying to figure out how to recharge the Lifeline while on the road. Sheeze! The answer was right in front of me! 2-1/2 foot long paired 6 gauge welding cable, a twin bumper (firewall) mount socket, a plug for the cables, two excellent clamps, and a genuine 80-amp breaker that mounts under the hood with the rest of the circuit. Tap directly into the alternator output stud. When not in use the harness unplugs. Drive 200 miles and the Lifeline is recharged. I must be getting old :(