I finished my BL36 conversion project and it came out quite nicely. Took it to work 12 miles round trip a few times (300 feet altitude difference) with no problems. However on my first day the juice ran out with full throttle (20-28 mph) all the time. With a more moderate speed no problem.
To find out more about the reach I did some current measurements vs. GPS speed and calculated theoretical operating distance (see attached chart). May not be super accurate because the current fluctuates quite a bit and I don't know the exact Peukert Number of my SLA Gel batteries but I thought it may be interesting for other e-bikers.