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2 x ZIPPY Flightmax 5000mAh 4S1P 20C That's the wrong pack. You need 5S, not 4S. You will kill your 9AH bottle battery if you connect it to the new packs.

that's a good start. Those gold connectors are not foolproof. Anderson connectors are better, as you are going to plug/unplug to charge the lipo packs, you can't take the risk that the terminals can come into contact wrongly. Let's wait until you get as far as you can go. Then come back and...

Here is a solution: open the base of your bottle battery, attach a 2-core 14 AWG silicon cable about 10cm to the two battery terminals, then crimp a pair of 30A Anderson plug to the other end of the 10cm cable. That's the Anderson tail, you can now plug in your new parallel lipo battery there...

where are you going to put in a hub motor? there is a hub gear on your 26" rear wheel. BBS01 is the solution. Don't worry about gear change, it's quite easy to get use to blip the brakes and change if you are climbing a steep hill.

is it this one? http://www.ebay.co.uk/itm/BH-Emotion-City-Plus-Electric-Bike-Panasonic-eBike-/281663234747 bike is excellent, battery not good, price fair. Does not have a throttle. Excellent buy if you are relatively fit and want to do shortish rides, 15-20 miles. If you want 30+ miles...

for battery bag in the triangle, I like this one:

like many concepts, the 2WD seems like a good idea until you try to build one or ride one. Motorized wheels are less stable than normal wheels when starting off, weight at the wheels make the bike less maneuvrable than normal wheels when cornering etc. Unless you have one of those specially made...

cwah can make his own battery and rack. He'll come up with something. If not, there is always the option of a suicide vest like John said.

for comfort, you want a good full sus bike, not too expensive and with good guarantee

£400-£450

you could indeed go for the 250W BBS01, but the 500W gives quite a bit extra power when you need it, within the same 25kph speed limit, and costs only a little bit more. Will it deplete the battery more quickly? no. Torque sensor: I have not ridden a cargo bike so can't comment.

Excel is very complete and yet lacking that simple facility to select all rows containing certain word. Hit control-F to open up FIND, enter the word eg 'FRED', then control-A to SELECT ALL. If you just want to delete all rows containing FRED, then it's easy but if you want to do something else...

I wouldn't want to ride 30 miles on a 20" folder without suspension. forget the 24" front wheel, the fork is too small for that. That bike is likely fitted with 170mm crank arms. You can buy a new crankset with short arms (150mm)...

as a guesstimate, I'd say the Krieger is good for commuting up to about 4000 miles a year, the Big Bear about 3000 miles a year. The Big Bear has the motor on front suspension fork, a little more tiring on your wrists for long distance commuting. The biggest maintenance bill is likely for the...

all the woosh bikes have a full throttle as in riding a motorbike, pedal if you want to. The Krieger has half width throttle on the left grip.

have you looked at the Suntour NCX seat post?

I have ridden all the woosh bikes and about 6 Kalkhoffs. The woosh bikes are good, I like the woosh Krieger (and the zephyr-B) best, but they are no match for Kalkhoff Impulse drive.

the voltage stabilizer capacitor is the largest capacitor you have in your controller. If that is a 470 microfarad then adding extra capacitance will help because that's not enough to support a large DD motor. Still, you get dimishing return as you keep adding. I reckon 0.1F to 1F is the range...

yes, that's right, use a Y piece to connect the two 5S bricks. Don't worry about constant discharge rate - you'll get plenty.

go for the Bafang BBS02 36V 25A 500W.