Built me a simple battery cooling box with a radio shack 5" 12v fan, small 12v motorcycle battery, switch and some ply. Put in couple rails to raise the batteries off the floor to get airflow completely around them. Haven't tried it at the field as I just built it, but it pulls lots of air through the tunnel. I think it will help get my batteries cooled off a lot quicker then just letting them sit in the shade. Just slide the packs in and flip the switch. About $40 without the ply.

Excellent !!!!!!..and simple ....great !!!!!

Another idea is use 4 or 5 inch PVC pipe with the fan on one end.. also run the fan from the power supply for the chargers..

just another way..

Scott Anderson
Team Tanicpacks.com
Team Castle Creations
Team FlitonUSA

Hey Robert I made one from a fan from a computer which was only 3" and I made the thing longer so I could do 2 packs or add something to help cool more, it does make a difference, so at the field today my packs in the shade before flying was 93 degrees and I really wanted them lower so I took a reusable cold pack like for sports injuries, stuck it in the incoming end and the batteries in the out going airflow, this really brought the packs down to a 80 degrees which I felt was better for a really hot day. I have always charged my packs straight out of the plane without cooling and never had a problem till last week when I used a pack that was 114 degrees off the charger not because of the charging but because they was 145 degrees when I started the charger, charging doesn't put much heat to a pack charged at even up to 3C which I do with smaller packs all the time but the 3850's I can only charge at 5 amps about 1 1/3 C, all this bought the cold pack up to 78 degrees real fats and cooled the batteries very nice in about 10-15 minutes, so the next time I tried a water bottle out of the freg and that helped also. I tried wrapping the packs with the cold packs and that helps but not near as much as the blowing air and the cold source. Next I'll get the bigger fan and build the same where both ends can be used.
Thanks for a great idea for these hot summer days.
Steve Maxwell
PS I used my power source or the deep cycle battery for power.

Did similar after visiting Phoenix one day and flying with Rusty Fried.. he had a similar cooler - I just improved on it a little.. in my opinion. Shown my self contained system. The TP5300 battery sits on top of the 12v battery such that the narrow side of the battery rests on the 12v battery - allows air flow around the battery and between the 2x 5300's. Rusty sells these fans as part of his boat store misc items.

Here are the fan specs - really pushes the air !!

Patented in-line design – provides ventilation for engine compartments, galleys, bilges, and heads. Mounting feet allow vertical or horizontal installation in confined spaces. Install with #10 fasteners. Individual carton includes 2 tie straps. All are CE certified. 16-gauge tinned and caulked copper wire leads with optional MP1 molded rubber connectors. New improved 3" design includes:

145 CFM Open Flow
3.1 Amps
3" hose
Nickel-plated motor can for corrosion resistance
Stiffening ribs to reduce housing distortion
Motor cap to seal wires and motor for water resistance

and a link to the fan.. this is not Rusty's store.. http://www.boatersland.com/att17314.html

sc

I always authorise all and sundry political parties to put a sign on my lawn. They're made of coreplast which is great for constructing lots of stuff, including cooling tubes. I have a 12v one and a 115v one. Tex.