How long do you let your batteries cool down time before charging? - HeliFreak
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600 Class Electric Helicopters 600 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


View Poll Results: How hot is the battery before you charge them?
very hot 0 0%
hot 4 7.02%
warm 29 50.88%
some parts are room temperature 8 14.04%
entire battery is room temperature 16 28.07%
Voters: 57. You may not vote on this poll

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Old 10-22-2007, 01:21 PM   #1 (permalink)
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Default How long do you let your batteries cool down time before charging?

Please only answer if you have some batteries that are over 75 - 100 flights so far with about the same cool down period. Trying to find out how long people let their batteries cool down before they charge them and they are still working fine with that cool down time.
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Old 10-22-2007, 02:19 PM   #2 (permalink)
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My batteries are more like hand warmer warm after a flight. If your battery is "HOT" or "VERY HOT" something is "very wrong".

The other thing is you batteries will discharge better if they are a little warm. Like 90F (32 C) over say 60F (15 C). Optimum is like 100 F (37 C) if memory serves me.

I would also -think- since they discharge better a little warm they would charge better. BUT is the pack starts to really HEAT while it is charging you have "problems"
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Old 10-22-2007, 03:04 PM   #3 (permalink)
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Warm for me, Like on the other thread we recharge after about 10 minutes. My heli has a lower throttle curve (95, 90, 85, 90, 95) with a 10 tooth pinion and 1800 HS. It comes down warm after 6 minutes flight time. My son's heli runs a CC HV-85 on Gov. mode, 2000 HS with an 11 tooth pinion. 4 minute flight time, comes in warm. Both normally put in 3200 ma to 3300 ma.

I can't remember where I read it, but I've read where you can "oversaturate" the motor by trying to run too high a headspeed than your kv and gear ratio will allow. Running over that limit will cause everything to run too hot! Clintstone or someone can elaborate on this.
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Old 10-22-2007, 03:05 PM   #4 (permalink)
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Everyones opinion on what is hot or warm is I am sure going to be all over the place. I don't have a temp gauge but I think mine are probably somewhere around 115F (maybe 120F max) after a flight and I consider that hot to the touch. I consider warm to be around 105. I probably should have put temperature ranges as the options instead of hot or warm. Others might think 115 as warm and 130 to be hot.

I think I will close this thread and put up a new poll with temp ranges. Does anyone else agree or should I just leave this poll as is?

I was thinking...

1. 100F or less
2. 101F - 105F
3. 106F - 110F
4. 111F - 115F
5. 116F - 120F
6. 121F - 130F
7. 131F - 141F
8. I light my cigarettes off my lipos while charging.

Last edited by xStatiCa; 10-22-2007 at 05:28 PM..
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Old 10-22-2007, 04:44 PM   #5 (permalink)
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I have an Align 6S2P 4400 mah (gasp!) with about 95 cycles on it. I have never charged it while it was above room temperature (say 75-80 degrees). Probably 30 of the cycles I put in the fridge after flying to cool it off quicker. Either way, I have always waited 45 minutes before charging. I am following the same routine with my FP 4900 mah. BUT......I am a known chicken.
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Old 10-22-2007, 05:19 PM   #6 (permalink)
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Quote:
Originally Posted by dlmcmichael View Post
......I am a known chicken.
David
A chicken with a 4400 WITH 95 CYCLES!!!

I have a small 12v ducted-fan which blows air over the pack before charging, but I am also a conservative flier with only warm batteries, not hot.
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Old 10-27-2007, 08:45 PM   #7 (permalink)
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Had a chance to check pack temps today, 3D flight in 20 mph winds, 65 - 70 degrees. Packs would be at 115 degrees.
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Old 10-28-2007, 01:36 AM   #8 (permalink)
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My packs come in at 110 to 120f and I let them cool to about 85 or so before charging. Takes about 15 to 20 min to cool. Got 112 cycles on a tpx 5000 and over 150 on a tpx 3s 2070. I have flown my other bats to death. I get op to 20 flights a week but with fall kicking in its down to about 5/week in the last month or so. dmn rain and high wind.

All I got left for packs are 2 for my cx, 1 tpx 3s 2070, 1 tpx 6s 5000, 2 tp gen3 1320 (1 2s/ 1 3s), and that pos align 2s 1200 that came with my 600. I have killed several align packs (no big task there), 3 mega power packs and some other cheep packs. 3 of my old packs have ben given to friends after 200 flights as they dont have the punch for hard flight anymore.

So it's safe to say 15 to 20 min cool down dose the trick.
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