John, Just shot a link of this conversation to Bob Buck. His response:
CHARGERS , OUR SMART CHARGER IS UNDER $ 40.00
AND I HAVE INSTALLED A 14.8V 3.5Ah BATTERY AND A 6 AMP RailPro THROTTLE W/SOUND IN A LIONEL 0-4-0 SLOPE BACK ALASKA ENGINE LAST YEAR .