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Use Li-ion Batteries Instead of Alkaline

97 bytes added, 15:14, 5 December 2019
== Cost savings==
* If your solution is not a low Total cost one then it of this design: $1.37 US* A [https://www.amazon.com/MakerFocus-18650-Battery-Shield-Raspberry-Arduino/dp/B07PS7DT62 similar commercial product] is not really appropriate.about $8 US
# Estimate your costs
# Find a commercial equivalent, cite it and put the [url in square brackets]
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