What size PVC do you want to use?
You can tell battery size(in mm) by the name. The 1st 2 numbers are the diameter, the 2nd 2 numbers are the length.
18650 = 18mm(diameter) & 65mm(length). That will fit in a 3/4"(diameter) PVC pipe.
Well there are 2 types of PVC pipe, schedule 40 and 80. They have different ID's. Also note the nominal battery numbers aren't that accurate. A protected 18650 is about 19mm X 68mm.
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