The ten-year battery that would not make five

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A water meter is installed once. After that nobody opens it again, and the battery decides how long the product lasts. If it runs out early, no update fixes it: someone has to drive out to every meter. We designed one with a ten-year target. Ultrasonic measurement, a report at least four times a day — one version over LoRaWAN, another over GPRS — and a single D-size lithium thionyl chloride cell of about 19 Ah.

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