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Old 01-05-2007, 10:05 AM   #1
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Default Battery Cooling?

ok i know that nearly every manufacture and matcher says not to but then why do companies come out with heat sinks/fans? much more has 3 versions i mean come on? are they good to use or not?
my batteries normally hit 118 cut off before peaking at 4mv per cell (3mv false peaks). so would a heat sink help me?
when should we use em? im in 30 degrees celcius heat when i charge so should i already be using one? or are they only for discharge?
cheers guys, sorry but this particular subject frustrates me.
So do we or dont we cool our batteries?
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Old 01-05-2007, 10:20 AM   #2
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The heatsinks are designed to evenly disapate the heat throughout the pack when charging or discharging, not keep the cells cool. They are deisgned to use when racing in very high tempatures, especially outside.
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Old 01-06-2007, 01:31 AM   #3
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at what ambient tempreture should i use a heatsink?
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Old 01-06-2007, 08:45 AM   #4
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I've used fans under my batts for charging, discharging and equalizing for more than two years with no adverse effects. The Two Lane Charger (reviewed on this site - http://www.rctech.net/reviews/review...e_futureal.php) uses internal fans to blow across the batts as they charge. Maybe for pro drivers who need every mA out of their batts, but for hobbyists? IMO, not so much.

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Old 01-06-2007, 09:01 AM   #5
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when charging a cool battery it allows the peak to occur at a higher voltage.
Higher voltage=higher internal resistance. Now your pack may have a higher voltage but it doesnt have the amperage to discharge quickly.....
Charging a warm pack the peak will not be as high but the pack will have less internal resistance. Which means your pack will discharge higher amps faster.....
If you charge cool w a fan you may see for the First minute your pack has extra punch (higher voltage....one it is consumed your pack flattens....then....drops......)
A warm charged pack will have constant power throughout the race.....
Now here is the magic question......
What is the ideal charging temp????
I havent found it yet......
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Old 01-06-2007, 09:46 AM   #6
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You should never force cool your batteries. Although they may feel cool, inside they could be getting very hot, if you didnt have the cooling on, youd feel this heat and maybe turn it off to be safe. Could lead to false peaking or even packs going bad
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Old 01-06-2007, 10:00 AM   #7
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What about putting a fan on them after there done charging.
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Old 01-06-2007, 10:34 AM   #8
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i live in a hot humid tropical country... if its not worth it to have fans blowing at the battery while charging, is it worthwhile to have fans blowing away from the battery (i.e. sucking heat away from the battery)?
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Old 01-06-2007, 10:50 AM   #9
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What I have been told from many reliable sources is that you are not supposed to cool any of the new cells (3800+) while charging. If the cells are not allowed to warm up, they may not peak correctly and will overcharge. This will very easily vent the cells, especially 4200's.
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Old 01-06-2007, 11:04 AM   #10
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If comes in aluminum and blue,red,purple suckers will buy it!

Wire heat sinks, battery heat sinks.. Come on. give me a break...
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