Mark, I used my laser IR thermometer. The chargers are the same temp as the air inside the cooler. The black surfaces on the batteries are warmer than the air temp.
I made a 30 ma trickle charger to keep 4 batteries topped off. So do the math, 120 ma and the battery voltage is 21.4 v would only produce 2.4 watts or .6w per battery. Don't really think that will make the battery that warm. The two dewalt charger shut down once the battery is fully charged.
I'm still convinced the LED's light produces heat to warm the air and the light energy, radiant energy, is being soaked up by the black battery. I could put aluminum foil over the battery and block the radiant heat.
Guess I'll have to measure the total current used here and post back.
Reguardless, I'm pleased this experiment works as well as it does using a 9 watt LED as my heat source. Not to mention it only uses pennies a day in electricity.
I started out using a 40w bulb and it didn't take long before the inside temp got to 100 and the batteries were even hotter. So I installed a thermostat that shuts light off at 88F. geo.
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