Today I powered my E+ for the first time on A123 20Ah cells 36V pack.
It was fantastic.
I build the pack week ago. It weights 7.2kg and contains at least 2.5 times more energy than NMH hub battery.
You must remember 8Ah hub battery due to chemistry has maybe 6Ah of usable capacity.
Discharge curves of NMH cells are rather miserable and drop like arock with Ah drawn.
You can see them in link I provided in mynext post.
Last Ah drawn are rather wth large voltage drop and poor performance.
Eplus front hub NMH battery feels relatively strong for first 2-3km of ride in level 8 and starts to fade out rather quick.
There is no comparison to A123.
To start with A123 charges to above 43V and its voltage drops much less , NMH by contrast charges to 42V.
Because of speeds I reached I was riding on streets with zero pedalling..
I was riding in level 8 all the time.
Reaching over 50km/h speeds like 52-53km/h many times for 5 minutes at the time was no problem .
It would not have been problem to sustain over 50km/h for longer but traffic lights didn't allowed for that.
Tipically at 53km/h E+ incredibly drew only 1300W of power according to Cycle Analist which shows how efficient Eplus is.
Voltage of the pack never dropped below 38V even after 18km ride.
I rode 25.7km hard with full accelerations many times on level 8 and used 8.1 Ah,

After 8Ah discharge voltage came back immediately to 39.5V moment after I reliesed throttle. Try to do it with NMH battery.
Motor got warmer than on NMH battery after over 50km/h sprints.