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May be a long shot, but I purchased a battery new from china last year - it was DOA until I established a Bluetooth connection to the BMS, and then enabled the charging & discharge port.

Another approach is to use waterproof trousers with overshoes built in. Decathlon do them. Keeps legs dry as well as feet, and pedal cleats still work if you use them

Do you get an error code on the display?

Any KT controller should work, mostly I use the controller integrated into my hailong battery base. You’ll need to splice into the hall / phase wires, but the colour codings have been established so not too difficult. Motor characteristics need programming into the KT controller too. Do a...

Had a similar experience with bbs01 controllers dying. Switched to external KT controllers 4+ years ago which have been flawless, even on bbs02’s

Assuming your legs are long enough, I’d recommend one of those full suspension decathlon bikes in XL size discussed on here recently. then add a Q128c 500w rear hub + hailong battery on the downtube.

Maybe 0512?

Yep I’ve done this mod too - especially useful on 500w+ motors. I only use the green momentary though, the red operates a ‘full beam’ handlebar light

One modification I always do is upgrade the supplied cap head screws to stainless versions. The standard cap heads seize, so sooner or later you’ll be having to drill & stud extract out. Another suggestion would be semi-permanent thread lock of the 2 cap heads which hold the anti rotation...

Ditch the small chain ring to create some space?

Hollow it out and use as a cover, then use an external kt controller

Yep sounds like pawls. Dt Swiss onyx pawls work on my bbs01

Only a tiny blob used in the spoke thread, and the grease tends to get pushed out away from the tube when winding in the spoke. Rim tape acts as a barrier. I’ve never seen inner tube dissolving problems.

A blob of marine (thick) grease on the spoke threads helps with this. It also equalises thread friction which I’ve found helps when truing, and hopefully slows rate of corrosion between dissimilar nipple/ spoke materials.

I had similar problems with a bbs02 hard tail. I settled on a 36hole hub with Big Ben tyre and all seems well. I also use a rim designed for calliper brakes, as I think these may be a bit stiffer. 14g spokes are optimum as well. I noticed recently that (fatter) 13g nipples (in certain rims)...

So 9mm clearance on the XL if the OP has a 110mm tall battery

From experience, I’d give Evans a wide berth.

Battery clearance looks tight but maybe possible in an XL size on this decathlon offering: https://www.decathlon.co.uk/p/27-5-full-suspension-mountain-bike-st-540-s-blue-orange/_/R-p-301117

isn’t the deal breaker here that CF dropouts can’t be filed out to suit the fatter hub axle?

Maybe try credit card charge reversal?