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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.

As the name suggests a works without any requirement of . One can also call it as the forever . These types of need to be shaken back and forth for few seconds and they will give for many minutes, sometimes even hours.

We offer both one time and rechargeable : (1) One-time use Lithium CR which is ready to use for convenience and (2) Rechargeable Li-ion RCR that can be recharged hundreds of times for long-term saving.

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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