Battery tram from Hobart to Brighton, seriously, Glenochy makes far more sense.
How does truncating the HNSR at Glenorchy make more sense, when all the growth and potential patronage is currently north of Glenorchy?
Brighton is the fastest growing community in all of Tasmania (followed by Kingston). A brand new high school is currently being planned for Brighton as an outcome of the current growth. Additionally there is considerable greenfield sub-division developments around Cobbs Hill Rd & Boyer Rd (Serenity Drive), Bridgewater; Black Snake Rd, George St, Akamas Drive & Laona Crescent, Granton - which all sit adjacent to the rail line and all of which were just large swathes of empty open land a couple years ago. All are key for providing easily accessible sources of patronage.
Furthermore, a huge brownfield redevelopment of the old K&D & Risby's timber mill sites in Austins Ferry which will become the Whitestone Point estate, perfectly straddles the line. Berriedale has significantly increased in density and also is the location of the (pre-COVID) most heavily visited tourist attraction in the metro Hobart region, MONA.
There is also pending future heavy redevelopment of the old industrial sites between Moonah and Montrose, which will add the sort of high density residential complexes, that increase the viability of rail transit.
As for "battery tram", the concept is far from the traditional "street tram" and more medium - light rail regional style rolling stock like the Bombardier Talent 3 or Alsthom Coradia LINT. Battery is just one motive option (the Talent 3's have a well regarded BEMU configuration). Ultimately overhead electrification would be final evolution of the concept, after being established with DMU / BEMU stock.