2001 Rialta battery won't hold a charge (even a new battery).
Engine battery loses a charge evidenced by inability to start the engine (not even a click of a solenoid activating), no digital gauges, no radio. Have tried jump start, no joy. Have tried battery charger, no joy. Have tried emergency deep-charge battery back-up, no joy. Understand there may be a conflict between engine battery and the deep-charge battery. Both batteries are probably original (10year old) but they test as being intact.