Thread: 18650 Batteries for bicycle lights
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Old 01-11-21, 04:44 AM
  #12  
bikebikebike
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Bikes: Downtube IX NS&FS, Dahon Speed8Pro/Matrix/Curve, Brom S2L,Montague Para, ICE-XL w/Rollie/Schlumpf, Trident Spike, ebikes, BFSatRDay

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OP:
go to https://batteryuniversity.com/
good intro
you have much to learn ,Grasshopper.
This is a huge topic
there is also a great flashlight forum, and the ES ebikers live the battery topic
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