Electronics > Beginners

Potting a battery?

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Lee697:
I'm planning a small project - an ATtiny85, LED, mercury switch and a battery. The battery I'm planning to use is a primary cell, 3.6V 1200mAh, although am open to similar suggestions.
(link to battery - https://www.jaycar.com.au/lithium-axial-1-2aa-3-6v/p/SB1771 )
This needs to be waterproof.
I'd like to pot the lot in casting resin.
I'm planning on a little protective sleeve for the mercury switch in case it was to break in shrinking/moving resin.
The battery - can I directly pot it? Should I wrap it first?
The circuit planned draws between 0.9-1.7mA @ 3V.
Thanks for any suggestions..... :)
Lee

coppercone2:
I think this is a bad idea. I think you should use a external battery like this and pot the wires in

https://www.us.schott.com/epackaging/english/products/battery-covers/lid-systems.html

I have seen things like hermetically sealed lithium thionyl batteries

https://www.mouser.com/ds/2/118/ltc7p-932904.pdf


then maybe just dab the connection points over the solder with low expansion epoxy.

Audioguru again:
About 59 years ago I made neon light chasers that used a 67V carbon-zinc battery. One exploded because the battery normally produced gassing and the potting caused the gas to build up a high pressure.
I do not know if the battery you are planning to pot produces gassing.
If you add a vent hole then it could easily become plugged by something.

Stray Electron:
  I think that most batteries today are sealed so I don't see why potting them would harm them.

techman-001:

--- Quote from: Audioguru again on September 10, 2019, 02:02:06 am ---About 59 years ago I made neon light chasers that used a 67V carbon-zinc battery. One exploded because the battery normally produced gassing and the potting caused the gas to build up a high pressure.
I do not know if the battery you are planning to pot produces gassing.
If you add a vent hole then it could easily become plugged by something.

--- End quote ---

Agreed, potting batteries can make them explode.

I used to repair constant loss speedway bike ("solo's") ignition units that used nickel cadmium batteries and they were always exploding.

The potting compound wasn't resin but a VERY tough slightly flexible material.

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