I know this is not a ideal solution because it's a generally poor charger compared to high end chargers that also charge with IR but I had this and it had overheating issues so until I can get a good charger I just fixed this one with parts I had on hand and about 2 hours of work.
You can squeeze a 40x40x20 fan if you slot the mounting holes.
Change out the heat sinks on the mosfets with quality thermal compound.
Move the existing 20x20x10 fan to add some air flow.
Drill various holes to help air move
And move the fan connections directly to the powersupply. The existing fan power is 7.3 volts. Moving the connections to the main powersupply gives better fan power 14something volts.
When I did this I found that all but one of the mosfets were not adequately soldered and that probably was the issue I had.
No issues anymore and its warm to the touch S before it was very hot but the air flow is about 3x as much now and the air is hot but that's good. Its moving the heat.
The existing fan ran on 7.25 volts so about 4 to 5 cfm
Now both fans move about 16 cfm maybe.
You can squeeze a 40x40x20 fan if you slot the mounting holes.
Change out the heat sinks on the mosfets with quality thermal compound.
Move the existing 20x20x10 fan to add some air flow.
Drill various holes to help air move
And move the fan connections directly to the powersupply. The existing fan power is 7.3 volts. Moving the connections to the main powersupply gives better fan power 14something volts.
When I did this I found that all but one of the mosfets were not adequately soldered and that probably was the issue I had.
No issues anymore and its warm to the touch S before it was very hot but the air flow is about 3x as much now and the air is hot but that's good. Its moving the heat.
The existing fan ran on 7.25 volts so about 4 to 5 cfm
Now both fans move about 16 cfm maybe.