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There are a few different types of that can be purchased that you could have for the those times of emergency.

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My wife and I have seen these advertised on television

https://en.wikipedia.org/wiki/Batteryless_radio

https://en.wikipedia.org/wiki/Batteryless_switch

https://en.wikipedia.org/wiki/Battery_leasing

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How to turn on/off camera LED / flashlight in Android – Mkyong