Dutch Bosch and bike blog show battery internals and a Neoprene Battery Cosy

[countryman663]

This chap
Mijn Bosch Elektrische fiets

is where I found the dongles ( if that isn't a compromising statement) and later on he goes into what's inside the Bosch batteries including charging,packing and a bit of history about the interior cells used.
He also links to what is in effect a battery cosy?!

(review here pedelec-biker.de: Schutzhülle für Bosch Akkus - FAHRER Akku Cover )

are these a useful aid to improve cold weather battery performance do you think

 

[Blew it]

That is a very interesting site, loads of information all in one place.

ENGLISH TRANSLATION

 

[Growbag]

Review of 17 ebikes from our Dutch friends
Elektrische fiets test 2013 | Elektrischefietsen.com

 

[Streethawk]

Very interesting, it's just a load of 18650 batteries inside there, and they look like they could be easily replaced with higher capacity ones, and as he states, with the best 3400mah panasonic batteries you'd get 490wh. Not a huge increase, but looks like a viable option once the batteries get old and lose a lot of their capacity.

About £20 for four and you'd need forty. £200 and you'll have a better battery than the £550 Bosch one...

 

[Streethawk]

This video shows the internals:

https://www.youtube.com/watch?feature=player_embedded&v=GVU9vEWL81U