Involvement:Expert (understands the inner workings) - Ownership:less than 1 dayPros:This holder is perfect for two 18650 or 19670 rechargeable batteries. The plastic is not very rigid, which ensures it won't crack under mechanical stress or vibration. Two plastic clips protuding from each side prevent the batteries from popping out accidentally.Cons:The protruding positive wire may push against the body of one of the batteries; if it doesn't have a positive tip that stands out, it may prevent electrical contact. It's easy to fix with a soldering iron (which you will most likely have anyway for assemblying your DYI project).OtherThoughts:Note: 19670 is the correct designation for 18650s with built-in protection circuit, which makes them 2mm longer than (unprotected) 18650s. Not all holders, chargers, flashlights etc. can accomodate the longer size.Bottomline:Overall, excellent quality for the price. Fits both protected and unprotected 18650 batteries.
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