I thought the HT had the 10 amp battery
Both in frame and rack style same capacity...No?
I think what has happened is that Trek have commissioned a lightweight battery (40.7v/6.4Ah/260wh) to keep the weight of the bike down, it stil feels like a 25+Kg bike.
The best specs I have found so far are here
TREK T80+ 2010 :: £1800.00 :: BIKES :: Electric Bikes :: CHEVIN CYCLES Otley UK. this shows the 250HT motor, specs for the other Trek's show the 250 motor.
My LBS has the 2009 Trek 7.3 with 250 on the motor, I would assume the HT motor would have 250HT printed on it, the battery is as above and is written in the manual as such.
What is confusing when you look at the BionX website is that they list the HT motor with the 37v/10ah battery, the rack version of this battery fills the plastic case, the 6.4ah battery runs half the length of the plastic case and that is what the Trek has (44 cells apparently).
Given the fact that Bionx only like their kits to be officially built by high end bike shops/manufacturers and will not supply lower end LBS with kit only means that Trek probably work very closely with Bionx to work out their requirements, this is also borne out given that Trek bikes will soon be supplied with the new Bionx IGH3 3speed 250HT hub motors
Bike Europe - News: BionX Launches Hub Motor with Integrated 3-speed I guess this mainly caters for the European requirement for low maintenance, easy to use, short journey commuter bikes.
Unfortunately this still leaves me wanting a 250HT or 350 with 10ah battery.