I had quite a hard time finding thermally conductive epoxy adhesive. There is a lot of gel, paste and grease, but not adhesive. I eventually found and used Electrolube TBS (TBS Thermal Bonding System), so far no issues but I don’t think I’ll be able to remove my ESC from the cooling plate easily.
With thermal paste I would have to find a way to hold the ESC against the heat sink with some kind of mounting bracket, and I couldn’t think of a clever way of doing that. Thermal adhesive is probably a better option, but I was not sure if my heat sink setup would work well and I wanted to have the option to easily swap to something else if needed. The tape seemed to be a good option for that. I am using a modified heat sink I found in my random parts bin, I think it’s from an xbox 360.
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An update, we built the battery and I tested the circuit which all works.
Unfortunately the battery doesn’t easily fit in the box with the ESC as I didn’t quite get the cable orientations and dimensions right. Also made a mistake with the BMS wiring so need to open it back up again.
Since I have to partially re-wire the BMS leads to one of the cells, I’m considering removing the BMS and XT60 charge cable from the battery, and instead wiring the BMS into the charger lead, and using the single XT90 to charge and discharge.
This would require some re-soldering of the positive and negative terminals of the battery which I’m hesitant to do, but definitely would create a lot more space and would let me re-orient the connector cable in a more favourable location.
I’ve also got a small external aluminium box which I can attach to the end to put the ESC which adds a bit of extra space, which is my backup plan.
@oldmate Would you mind sharing the specs of your battery pack, and where you got the box? I am waiting for my spot welder to arrive. Planning to start with a 11s2p or 3p. I just started with my built and trying to find all the bits and pieces. Sometimes not easy here in New Zealand 
Cheers from Mount Maunganui
Hi,
I’ve not had much luck with the BEC you list on your initial posts.
I’ve blown 2 of them on a 12s pack and finally ended using a different one.
Let me know if this works for you as I’m curious if I had a bad batch or is actually not linking the 12s.
Cheers,
Jordi
Hey @cube it’s a Camdenboss
My battery is a 12s2p made up of p42a molicel cells, laid out in a 3x8 pattern using a design from elsewhere in the forum.
There’s a crew in the mount who have built a bunch of these and seem to have the setup dialed. They go for 10s3p builds, and put the esc in an external box on the end. You should hit up @marcoz to see how they do it.
Thanks for your feedback. Very much appreciated!
@marcoz Hey mate. Another newbie here and also located at the mount. Would you mind coming along next time you are going out and have a closer look to your DIY?
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Hi @oldmate, I’m planning on building a very similar setup also in NZ. What width and thickness nickel strips did you use in your battery?