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nRF52 battery life estimation

Hi, I want to estimate the battery life of my nRF52 device operating on a battery of capacity 800mAh. Device will advertise once in every 10sec with an advertising interval of 125ms and timeout of 1 sec. A BLE scanner device will get connected to it and read the battery level as notification. Once the scanner reads the battery level it get disconnect to the advetiser. Minimum connection interval is 7.5 ms and maximum connection interval is 30ms. I would like to know how long the battery of the advertiser can withstand.

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