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What batteries is everyone using?
Most are using Samsung 30Q button top 18650's. Requires 8 "button top" cells. or 4 for the short tube.
3/4 mile across the lake. Hot humid night. You can see the humidity in the air in front of the moon.
4 batteries can be used with the long tube as well, you just need to insert both (one with batteries + one empty) carriers. The recommendation is the batteries in the end carrier for balance, if you run it that way.
As buckten has stated. Samsung INR18650-30Q. With button top.
8 of these, will give you 24,000 mAh of capacity.