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For my unit, I put two 7.5 Ohms resistors on the heat sink to help with heat. Using it to test the 32650 LiFePO4 battery, the discharged current is about 0.7A with the resistors load which would be too long for a 5A battery (5-6 hours). So I put a auto light bulb in parallel with the resistor to bring the current to about 2.0A. The unload capacity read 4.511 AHrs. After that, I recharge the battery again with the LiitKaLa charger that need an adapter due to the 32650 is too big for the charger. The charged capacity read 4.658 Ahr