I came across what I think is a good deal on a battery for the 1949 8N. Not every TSC store has them, at least not the one I was after.
Power up your vehicle with the Traveller 6V 875A Heavy-Duty Battery. This quality automotive battery is reliable, compact and compatible with a range of makes and models.
Cold cranking amps: 700
BCI group size: 1-6V
Automotive battery fits in various makes, models and years
Traveller battery features a top-post terminal type
Reserve Capacity: 150 min SKU: 132347299
The new replacement for this battery will wear the Interstate badge, cost more and be less powerful.