Electronics > Projects, Designs, and Technical Stuff
Batteries in a "small vacuum"
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Toffe:
Hello.

I was planning to add a logger function to my "vacuum chamber" to indicate for leaks over time. My plan is to have a circuit to log pressure using BMP180, and give an indicator if there is leakage over X number of psi after 15 minutes.

My problem is batteries, will they withstand 5-7psi ? I think that is no problem but I want to hear a better opinion from other. Thinking about mt. everest i read is -4psi and I do think people brings their stuff up there with batteries?

Any good ideas? THinking about 9v Lipo or 2x AA batteries or coin cell. Not sure yet on what to use which can power the arduino without beeing too big and clunky.
Conrad Hoffman:
Almost all batteries are designed to vent excess pressure, so I'm guessing they won't be happy under vacuum. Duracell specifically forbids it.
Toffe:
Even down to 5-7 psi? So basically you cannot take batteries to everest? No camera, no phone, no watch?

Full vacuum i understand (1psi) but just wanted to make sure on a half vacuum kinda :)
IanB:
It depends on the kind of battery.

Alkalines have a mild seal to prevent them drying out, but it is a low pressure seal. Vacuum may cause the vent to open. However, alkaline batteries are disposable, so for a single 15 minute occasion of data recording I wouldn't worry about it. It will be irrelevant.

Some other batteries like NiMH and lithium ion have a much tighter seal. I am sure they would be fine if you used those. NiMH cells in particular are designed to withstand very high internal pressures without venting. So for them a mild vacuum on the outside would be nothing at all.
jbb:
Non-rechargeable coin cells might be good, too.  But capacities are a little limited.
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