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so I dont have a multimeter to hand but I realised the battery does have a usb power outlet. Upon testing it initially there was no power to any of my devices then miraculously it started up and began charging again. What is that all about?!

So does the Bosch bike battery comprise either an NMC or a NCA group of cells?

Ah - so that advice goes against the information in the article you linked to which suggests sub zero charging is fine albeit at a slower rate than the optimal temp range of 20c. No I'm confused again!

Thanks folks -This is really useful - concensus seems to suggest Bosch/lithium ion batteries can handle sub zero storage with no ill effects. As long as they are not charged whilst below freezing. I do charge the bike after riding in below freezing conditions but I guess that's fine to do as the...

Hi Folks I have just bought a new Bosch powered bike with battery in downtime. Having lost both keys though (doh!) I'm no longer able to remove the battery and the bike is kept in sub zero celsius conditions in the bike shed. It's dry but it's cold. I cycle it into work where it's then stored...

I used a soft hose on mist setting so it should be fine :oops: definitely no more pressure than road spray would throw at it .Fingers crossed it should be ok...

I will have a look at the weekend whenI get some luxury of daylight to see what's going on. If I cant use a hose to clean off a muddy, cruddy bike what would you recommend to wash it down and stop the parts from corroding with all the salt they chuck on Scottish roads?

Great thanks. _i'll try that tonight as you suggested. I had previously washed the bike with a soft pressure hose and brush. Maybe water got into the motor. Is that where the controller is? If it's shorted is the whole thing a goner?

Ohhh I wouldn't know how to take that kind of reading! The light's come on when I press the battery self test button though. Does that mean it's all good with the battery or could the fuse still be blown?

Hi Folks Just wondering if any of you had experienced this and whether it was a quick easy fix. Attached the battery to the bike this morning and pressed the power on button on the display. Nothing. Initially thought the battery was the issue but it has full power. nothing else has changed...

Fair enough -I'm obviously expecting too much grunt from a bike that is happy to pootle along! I just got an electric scooter which can go 40mph+ so should I need the extra power I have it albeit in a completely illegal form!

I get that. I think I might be a Bosch fanboy! Ive done 13200+ miles on my modded sport cx and it's not caused one problem. I think these units are built to last forever. Of course now I've just said that....

Jeeez! After reading all of this I'm wondering why I bothered fitting a TSDz2. My modded Bosch Motor bike seems like the better option on every level. I just wanted a nice assisted bike not an electronics course/project. Then again maybe I didn't realise what I was getting into!

So effectively, without a temp sensor I should regulate my power usage and go easy when I notice the motor is giving out less assist to the cranks than I feel it should? Getting a temp sensor fitted feels like a bit of a pain but I may be wrong!

Crikey! I never knew I was going down such a rabbit hole. Naively I assumed it was a fit and forget system. Best start reading the posts and do some proper swatting!

Definitely not 65c - more like 40c as in pleasantly warm to touch on after being out in the cold. How can I check if the windings are damaged? Are there any pics maybe?

Should the motor feel warm to the touch after a period of usage (40mins)?

But the whining only lasts for a few minutes of riding...?

It's when I'm going up hills I notice the power drop-off so cadence is very low