bms 36v 20ah lion shrink wrap battery, altering size

[rpurchon]

i have a bms shrink wrap battery, like a lot of others have on here.
i had it fitted to rear of bike like d8vh,but bike felt top heavy.
i wanted to fit it into the triangle like my lipos were.but it wouldnt fit.
i ummed and arred about altering it.
it wouldnt be guarenteed if i altered it.doh it isnt guaranteed anyway,and i wouldnt be sending it back to china no matter what.
so i pulled all the foam off.
the battery is made up of 20x10ah cells,it should be 10x20a per bms web site.
which makes the 10cell bms a bit pointless.
the battery are held toghether with the yellow cellotape.nothing else.
so big soldering iron,on 1 joint and it came apart no problem.
i split the pack so it was at 14 cells or 4" wide with padding.
then put the remaing 6 cells on top,this reduced height by 1".
then linked them with some 12g wire.
i wrapped the cells with cross weave tape to prevent them moving.
tested with meter,sh*t 22v.pluged charger in and reset bms,back to 42v.
been for 20mile ride down canal,no pedaling and all ok.
richard

 

[Zebb]

You say reset the bms how did you do that, just by plugging in the battery charger or other.?
I keep wondering if my lipo4 would be able to change shape.

My first thoughts of a big hammer might not be a good one.!

 

[rpurchon]

You say reset the bms how did you do that, just by plugging in the battery charger or other.?
I keep wondering if my lipo4 would be able to change shape.

My first thoughts of a big hammer might not be a good one.!

yes plugged charger in and that was it.
the bms make was ecitypower.
richard

 

[iain85]

Well I've just seen this thread after spending the evening in my garage umm ing and arring the same thing. I have the same battery and my inner triangle was marginally too small (5-10mm). After a little persuasion it's wedged in nicely I have secured it using metal banding so it's a little agricultural to say the least but im happy the battery is in the frame now lowering the c o g hugely. I made up a fly lead to check the battery wasn't damaged in the install and it seemed to work ok! Il make a new lead up tommorow and take her for a test ride. I'm super excited although am a little apprehensive that the foam is the only thing taking the shocks from the trail. Hopefully the battery can take it.