Kraftmax BC-4000 Expert Lithium charger fan dock
thingiverse
My Kraftmax BC-4000 Expert (I'm sure its sold under various other names and brands) battery charger/tester gets very hot on the bottom when capacity testing Lithium Ion cells at maximum current. To help mitigate stress from heat I designed this fan dock. Use a standard 80x80 mm PC fan. Connect to the USB port on the back of the charger. Use a boost converter module if necessary.
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