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Your charger should be set to 178V minimum, higher if it's colder. If you're seeing a voltage drop in 2-3 hours, you're probably dealing with heat build-up in the pack as it doesn't flow for **** w/o the fan.
What is your charge current? We could use some grid charger details.
You can ground the PWM wire of the fan with a ~21K Ohm resistor and drive the fan with 12V, but it pulses annoyingly. Best to get a POT you can adjust in that range.
Are you saying you had a drying blowing into the fan exhaust in the trunk? If so, yo did nothing but pressurize the IMA cavity. The inlet has a flapper to prevent backflow.
Here are my recommendations...
Remove your IMA pack.
Take it inside to a controlled environment (~75°F).
Blow a box fan through it
grid charge it for 24 hours.
Connect a lightbulb socket to it, maybe 2 in series and install incandescent bulbs. If you do 2 in series you'll want to do 200-250W bulbs. If 1, use 100W (note you may blow out 1 due to the high voltage compared to 110V bulbs).
Discharge until you hit 120V.
Swap out bulbs for 60W and run it down to < 12V.
Grid charge for 24 hours.
Re-install and assess.
This will effectively "refurbish" all the sticks in your pack in one go. It will either work, or it won't, it depends on the health of your sticks. As it stands, it can't make anything worse.
Steve
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