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https://www.sjscycles.co.uk/chainrings/38-stronglight-dural-130mm-bcd-5-arm-inner-chainring/

Not necessarily true, the battery could be fine if it had a chance to charge up fully. If the charger is only putting out 36V the battery has no chance of being any higher.

If it is the same as a standard Yamaha battery you may not get full voltage at the battery terminals until it is on the bike and switched on. Mine will read 38ish V until it is switched on then goes up to 41.something. I measure mine at an external connector I have fitted to connect my extender...

Open circuit voltage with a digital multimeter is meaningless.

Ok with you as long as the actual speed remains the same.

I understand that and have done the same with my Haibike for use in the mountains but I thought with a hub motor if you are going too slowly then the motor is less efficient and generates more heat.

Won't going even slower just mean the motor becomes less efficient necessitating another lower gear which will make the motor less efficient ad infinitum?

I use 2 nail brushes held together!

Do let us know what you go for and how it performs.

Less voltage sag, fewer deep discharges, potentially longer life.

I don't think a 250w geared hub will be able to maintain anywhere near 10mph on the hills around Tow Law! I only have limited experience of geared hub motors but do know the hills around Tow Law well. I do know the geared hub motors (Q100) I have ridden have had nowhere near enough power to deal...

You will not seal it, water will get in. When it gets in it needs to get out. I have lost count of the times I have come across this sort of thing in my professional career. Silicone sealant will work for a while but will not work like a proper potting compound. We used to join burried cables...

That box will do nothing apart from keeping the water in. There is no way you will get that gland to seal all of those small cables effectively. Soldering instead of connectors is good, glued heat shrink is good, self amalgamating tape is good. Unless you have exposed connectors / conductors and...

600W in Austria!

The clue is in your last line, that is why people come off them! If you want some grip while in a hurry get something softer.

Marathon plus tyres are probably one of the biggest causes of 'offs' in the winter time for the demographic of this type of forum. The rubber is a very hard compound anyway that gets even harder as it gets colder. They are designed for leisurely long distance touring, leisurely including...

Ok 80% but it is you that is talking crap! If he is hamering it he can easily flatten the battery in 20 miles. No one can state a milage, terrain varies, riders vary and speed varies and to claim you can get 43 miles at near max power is silly. If you are using 400W (max is about 700) you will...

I can get over a hundred miles out of mine (not when I am in the Alps)! Actually true but meaningless, everyone's hills are different, everyone's journeys and requirements are different. It is easy to check the capacity as outlined in the manual above. The warranty would only be for something...

https://www.manualslib.com/manual/975488/Yamaha-X94-Series.html#manual

You can do any of your suggestions but first it may be worth checking the battery capacity, this manual will tell you how see page 19. https://www.manualslib.com/manual/975488/Yamaha-X94-Series.html#manual If you are getting that low then you are giving the battery a real pasting, the last 10%...