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Yep that is the one I have used and linked to in the past. Very reliable but now unwilling to post to the UK under current battery restrictions on air freight to the UK except using more expensive approved shippers. Whilst still a good deal, you need to order 40-60 plus cells before it becomes...

Yes all on hold. Rather diappointing given how much it was played up but understandable by a company that cannot risk its reputation or quality and reliability. I myself have been working on Brompton conversions for some time. This is my latest and lightest using a M2L-X and a light weight...

Except all batteries are not the same. Many of the cheap torch batteries cannot handle the constant current draw resulting in voltage sag leading to low performance and the BMS cutting out. In addition the capacity of those batteries are often way over specified. You need to check the...

Nice to see that Tern have put the welded lug on the front for fixed luggage i.e. the weight does not sit on or turn with the steering. Jerry

Yes i.e. not plug and play. Regards Jerry

Please note Lipo and LiFePO4 cells require different charging voltages. Typically LiFePO4 cells are 3.3V are rest and 3.6V fully charged and Lipos 3.7V at rest and 4.2V fully charged. This is where a BMS takes away any complication in that all this is taken care for you including max discharge...

Water can cause problems in heavy down pours. I had a Cytronex once and the lights use to play up all the time in a heavy down pour. Most controllers I have seen in DIY affairs are water resistance which as stated, unless you submerse them in water would be fine. Regards Jerry

Agreed. I am not sure about Konions, but with A123 cells you can cut them in half or put a drill through them without any fear of combustion. Both A123 and Konions cells can be under or over charged without fear of combustion though good chance you will ruin them, less so with the A123s. I am...

They seem to have a poor write up :( Jerry

Lipos are safe if used correctly but IMHO I don't think they are plug and play. I personally would not leave them in my office or charge them in the house. I think the risk is quite low as I said if you know how to use them but when they fail they fail spectacularly. I would certain not make...

Good call Frank I always fancied trying these though probably a little big/high capacity for my requirement. Jerry

That the beauty of the 2.3Ah A123 cells is that they will deliver 60A constant even if at that they will drain in about 5 mins lol They are still available if you check my post here however I think there are better alternatives, though as Mike says you need to look carefully at your...

Arbol, Yes only the 100mm + Keyde Goldant motors have the controllers built in. The 80mm ones use the external controller shown in this thread which unfortunately is pedelec only. Good thing is the newer ones now have the cable exiting the other side below the axle so it does not interfere with...

Thanks Paul. One bike would never be enough for me, but if I had to only own one it would be the M2L-X. All through the summer I have been using this 11.5KG Brompton including the Goldant fitted. Its just fantastic to have such a light weight portable bike in the summer for popping into pubs on...

Yes the smaller Keyde motors are economic with capacity (that sounds good lol) but of course you are helping the motor all the time by pedaling. I would say it requires about a 1/3 of the normal effort to maintain 13-14mph. My larger Tongxin motors have more grunt and you can cruise more with...

All good advice from Dave. Note the Keyde and Tongxin motors can be purchased in a 260RPM configuration which should give you a higher assist speed though I am uncertain how that might impact their reliability on steeper climbs. Again if you use a programmable controller to keep the current...

Re different battery choices I have a selection of three all of which fit in the front Brompton bag. 2.3Ah, 3Ah (1kg) and 6Ah (2kg). This gives me 8, 15 and 25-30 miles respectively. Again over very flat terrain and using lower powered, light assist motors. I am very much of the opinion...

A lot depends on how large a capacity battery you need. On my Brompton its a 3Ah battery in the front pocket of a bag on the front and only weights 1kg. This capacity easily covers me for my 10 mile daily round commute. I use very small light assist, low power consumption motors. Interesting I...

Or rethink your battery ? Do you need to carry that amount of capacity for every trip ? Jerry

Agreed an excellent document for someone to start with. Jerry