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Check the listing for details. 8CH 18650 Battery Internal Resistance Tester Support Active heat dissipation. Condition: New. Listed at 50.87 USD. Heat Dissipation: U-shaped groove at the back is combined with PCB board, and the fan actively dissipates heat to form a heat dissipation channel. Applicable Battery: Can accommodate 8pcs 18650 batteries (Batteries are not included).