NASA NTRS · 19810000067
Pressure Switch Is a Low Cost Battery Indicator
Abstract
Conventional pressure switch, fabricated by printed-circuit manufacturing techniques, can indicate when charge on battery departs from preset level. Membrane on switch is exposed to internal pressure of battery, which varies according to stored charge. When pressure varies from preset level, switch can turn on a light-emitting diode or similar indicator to warn user that battery is low.
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Abita, J. L.. 1982-09-01. Pressure Switch Is a Low Cost Battery Indicator. https://ntrs.nasa.gov/citations/19810000067
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