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Found this site very interesting and thought it may be of use to other members. Obviously covers battery types and technologies beyond our sphere of interest, but appears reliable, understandable and informative: http://batteryuniversity.com/learn/

Hi Gray, yes - I'm sure you're right. d8veh seems to be a particularly knowledgeable and prolific poster and no doubt there are plenty more helpful types like him on this forum (and Endless-sphere, although I haven't ventured much onto their forums, yet). Really interesting to see what others...

Ah! A fellow newbie with the same problem as me ......... the Black Art of electronics! I've tried rolling up my trousers, standing on one leg whilst I sacrificed a cauliflower with a 1980's Suntour rear mech (well, it had to be useful for something) , but I still don't understand the lingo. Can...

One wheeled trailer design with power assist: http://www.atomiczombie.com/CycleBully%20Electric%20Assist%20Trailer.aspx

Thanks Helen - that certainly sound like the sort of kit I need

Thanks - Good point re pedalling. I like the triangle battery bag idea, or possibly the type that utilise the water bottle lugs, as I suspect the size of battery I need mounted on a rear carrier could make the bike a little tail happy!

Many thanks for the information - I've had a look at the two options and the BBS01 looks favourite. Next decision is whether to build from scratch or add to my retro Parkpre Pro 825. Nice steel frame, but very light and I may be safer using a more robust Merlin or Claud Butler ally job

Many thanks for the information - I wasn't aware of built-up power packs and will now investigate further. The reason for mentioning my condition was primarily to emphasise the importance of range, but your sympathy is much appreciated.

Hi everyone, I've been a keen trail rider for many years and have built several bikes for myself and my family. I am rapidly approaching 60 and have recently been diagnosed with a rare muscle-wasting disease, which is severely impacting my ability to cycle more than a few miles, even on the...