How long do you let your batteries cool down time before charging?

xStatiCa · 10-22-2007, 12:21 PM

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.

DebianDog · 10-22-2007, 01:19 PM

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"

wren1702 · 10-22-2007, 02:04 PM

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.

xStatiCa · 10-22-2007, 02:05 PM

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.

dlmcmichael · 10-22-2007, 03:44 PM

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.
David

Efliernz · 10-22-2007, 04:19 PM

Quote:

Originally Posted by dlmcmichael

......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.

wren1702 · 10-27-2007, 07:45 PM

Had a chance to check pack temps today, 3D flight in 20 mph winds, 65 - 70 degrees. Packs would be at 115 degrees.

Raven_darkcloud · 10-28-2007, 12:36 AM

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.

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

10-22-2007, 12:21 PM	#1
xStatiCa Registered Users My HF Map location Join Date: Jul 2006 Location: New Port Richey, FL	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.

10-22-2007, 01:19 PM	#2
DebianDog Registered Users My HF Map location Join Date: Mar 2005 Location: Powhatan, VA	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" __________________ Dan Da Dawg - JR X9303 Hexa F550 on 3S + 6S TREX 500 + 6S TREX 600 + Blade mSR + Blade mCPx2 Brushless + 12S Rave FBL ENV

10-22-2007, 02:04 PM	#3
wren1702 Registered Users My HF Map location Join Date: May 2006 Location: Wren, Mississippi	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. __________________ Alan Haney T-Rex 600E in 500E Hughes Swift 16 Flybarless in Approach Cobra Outrage 550..........Outrage G5........Phazor 600 In memory of: James Archer

10-22-2007, 02:05 PM	#4
xStatiCa Registered Users Thread Starter My HF Map location Join Date: Jul 2006 Location: New Port Richey, FL	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 04:28 PM..

10-22-2007, 03:44 PM	#5
dlmcmichael Registered Users My HF Map location Join Date: Mar 2007 Location: Pinehurst, NC	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. David __________________ YOUTH is not wasted on the young.....WISDOM is wasted on the old. Realflight G3.5 Helimax AXE EZ EF Sabre FP Align T-Rex 600 Goldberg Falcon 56 Great Planes PT-20 Great Planes Super Aeromaster Top Flite Giant Scale P-51 Nissan Minivan (Wife and Kids)

10-27-2007, 07:45 PM	#7
wren1702 Registered Users My HF Map location Join Date: May 2006 Location: Wren, Mississippi	Had a chance to check pack temps today, 3D flight in 20 mph winds, 65 - 70 degrees. Packs would be at 115 degrees. __________________ Alan Haney T-Rex 600E in 500E Hughes Swift 16 Flybarless in Approach Cobra Outrage 550..........Outrage G5........Phazor 600 In memory of: James Archer

10-28-2007, 12:36 AM	#8
Raven_darkcloud Registered Users My HF Map location Join Date: Mar 2006 Location: Portland, OR	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. __________________ Team Outrage OPM - Fly it like it aint yours! To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. JR X9303 2.4 Baby. I have felt the difference and I like it! Don"t make me list 'm all !

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