* Depending on the metal battery clip style and plastic thickness, the battery positive terminal may not make good contact, without carving some of the plastic away with a knife.
* Total cost of this design: $1.37 US
* A [https://www.amazon.com/MakerFocus-18650-Battery-Shield-Raspberry-Arduino/dp/B07PS7DT62 similar commercial product] is about $8 US
# Estimate your costs # Find a commercial equivalent, cite it and put the [ url in square brackets] # Calculate $ savings and % savings
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