probably in two groups of 5 cells, each group will have a small PCB to connect the pouches together. Just a guess, they're roughly the size of the largest blue brick, top right. Gens Ace is grepow lev.
I've heard Woosh will have a rear wheel Big Bear kit with optional 36/48V next month, same price £549. I don't know if it's CST though. I think at that price, it's probably freewheel.
I would have recommended the Tornado if it were fitted with Auriga discs.
The alternative is to get a 26" hybrid bike with decent forks and hydraulic brakes and fit a Big Bear kit. You end up with a nice bike, strong motor and 15AH battery.
Like this Cube Aim SL26 (£479 + £549 for the kit)...
the Arriba has torque sensor and hydraulic disc brakes, the Escape is the larger size Arriba for 6fters. The Tornado has cheaper PAS instead of torque sensor and cheaper cable operated disc brakes, the Typhoon is the larger version of the Tornado.
how much gyroscopic effect contributes to keeping the bike upright?
to answer that question, ride a 12" wheel e-bike/motobike at 15mph and a 700C wheel bike at 5mph. Both give about the same gyroscopic effect but the forward momentum is very different at 15mph against 5mph.
now you've had a go on the ezee (some say they are the best of the hub kits out there), how do you compare the axcess Mustang with falmouthtony's conversion?
the BPM is overkill for riders weighing less than 100kgs. It has too much power if you are not overweighed, it's like riding a motobike.
You want to keep your legs strong, buy a CD.
better traction than the Bosch classic crank drive, not all crank drives.
The P hub motor has 40NM maxium torque. I noted in their leaflet that the the controller is programmed for powerful start, meaning possibly that maximum torque is delivered right at the start.
The Ezee (80NM) and BPM...
you'll like the pedelec torque sensor system more in a week. It may not suit everyone but the system has great advantages: reliable and long lasting motor and electronics and help you keep your legs strong. The motor and electronics cannot be overloaded, so they go on for many years totally...
How many clicks per revolution of the cranks?
You said earlier that the click disappears when cycling unassisted, that rules out the pedals, cranks, chain, cassette, pedelec rotation sensor, sprag clutch as possible source.
I know Woosh use chargers from sans electronics, a good company.
http://www.ebay.co.uk/itm/Genuine-SANS-Modiary-or-Economy-Li-Ion-battery-charger-for-e-bike-24V-36V-2A-/321415875183
You need to select 42V, 3-pin XLR, Sans
it's a bit more expensive but better.