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07-02-2008, 05:34 PM
| #1 |
| RCC Addict Join Date: Feb 2006 Location: ccxc
Posts: 1,176
|  Noise when charging Nimh?
Anyone get like a pfff noise here and there charging 2/3A cells? I was charging and 8 pack of 1600 at 1.5 and it was making this weird noise. Its the second pack like this.........
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07-02-2008, 05:56 PM
| #2 | |
| Pebble Pounder Join Date: Dec 2005 Location: Metro NYC
Posts: 147
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07-02-2008, 06:05 PM
| #3 | |
| RCC Addict Join Date: Feb 2006 Location: ccxc
Posts: 1,176
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07-02-2008, 06:10 PM
| #4 |
| Rock Crawler Join Date: Aug 2007 Location: Columbia, TN
Posts: 813
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I've got 8 packs now and every one of them does that right before the charger kicks off. There was a thread a while back about this, and there were some pics from some folks that have even had the cells split open on them, but so far mine all do fine and there's no visual damage. Age of the pack doesn't seem to matter, and neither does the places I got them from, they all vent like that no matter how I charge them.
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07-02-2008, 06:23 PM
| #5 |
| RCC Addict Join Date: Feb 2006 Location: ccxc
Posts: 1,176
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hmm...just never seen it. Kinda freaks me out
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07-03-2008, 03:36 PM
| #6 |
| Rock Crawler Join Date: May 2007 Location: lacey
Posts: 833
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turn down your amperage a little, maybe 1.0 or 1.3. noise is bad!
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07-03-2008, 04:28 PM
| #7 |
| RCC Addict Join Date: Feb 2006 Location: ccxc
Posts: 1,176
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turned to 1A but still noise.
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07-03-2008, 04:29 PM
| #8 |
| owner, Holmes Hobbies LLC   Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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Got a temp gun to monitor the cell temps?
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07-03-2008, 04:31 PM
| #9 |
| Pebble Pounder Join Date: Dec 2005 Location: Metro NYC
Posts: 147
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how many volts does the pack have in total? you really need to find out if the venting caused a cell to go bad. The noise is by no means "normal" and it is telling you that something is going wrong.... |
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07-03-2008, 04:34 PM
| #10 |
| Rock Crawler Join Date: Sep 2007 Location: Colorado Springs
Posts: 960
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I have all packs from JRH. My 3 9cell packs do not do it. When I charge my son's 7cell split packs, they make the noise too. I charge at 1amp for everything. Same charger or different same result. I have not seen any temp spike on any packs, just the noise. The noise is constant though out the charge? Hasn't impacted performance.
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07-03-2008, 04:48 PM
| #11 | |
| RCC Addict Join Date: Feb 2006 Location: ccxc
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07-03-2008, 05:13 PM
| #12 |
| Keep it real  Join Date: Jun 2006 Location: Yakima,WA
Posts: 6,532
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8cell packs peak way higher than 9.6v  I've got 2 packs that are 10cell packs(12v) that peak over 16v. But mine don't vent. |
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07-03-2008, 05:39 PM
| #13 |
| RCC Addict Join Date: Feb 2006 Location: ccxc
Posts: 1,176
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so maybe the 11-12 is normal???
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09-05-2008, 09:23 PM
| #14 |
| I wanna be Dave Join Date: Mar 2008 Location: In the Dark Edges of your Mind
Posts: 6,386
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Bringing this back up from a few months back... I just witnessed my 6 cell 2/3A pack PFFTT right before charging was complete. I think all the calls did it in like a 10 second period, then the charger went to trickle mode. The cells were warm but not hot. I have heard the noise before. It doesn't seem to affect anything as far as runtime goes. Any difinitive answers about the mysterious PFFFTT? I know they are venting, and it sounds like many people's 2/3As do this... so is it typical? OK?  |
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09-05-2008, 09:26 PM
| #15 | |
| I wanna be Dave Join Date: Nov 2007 Location: Memphis
Posts: 4,786
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09-05-2008, 09:35 PM
| #16 |
| Rock Crawler Join Date: Jun 2007 Location: oVER ThErE
Posts: 600
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I have three battery packs all 2/3A 8 cell 1500 and all three do it right before they shut off. I have two different chargers and they do it on both chargers. They peak right at 1350 11.6V... Also a few other guys that run the same batteries here locally have the same thing happen right before they go to trickle mode...
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09-05-2008, 11:18 PM
| #17 | |
| I wanna be Dave  Join Date: Jan 2006 Location: Corruptifornia
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09-05-2008, 11:43 PM
| #18 |
| RCC Addict Join Date: Jun 2008 Location: Mudville
Posts: 1,592
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ya, venting cells says bad cell, or poor manufacture. im no battery or electronics expert, but i know enough if any battery pffs at you, its Not a good thing. its not making a pass at you. lol ive never dealt with a123 cells, but any battery that pffs at you, is looking to cause damage imo. again im not an expert, but when NiMH or NiCD batterys pffft, they like to go POP shortly afterwards. |
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09-06-2008, 01:25 AM
| #19 |
| I wanna be Dave Join Date: Jan 2006 Location: Corruptifornia
Posts: 12,107
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Timmahh, Please re-read this thread....nobody said anything about A123 cells....they said 2/3a (size) cells.
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09-06-2008, 03:43 AM
| #20 |
| Pebble Pounder Join Date: Jun 2008 Location: UK
Posts: 137
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Just to throw another idea in the pot, don't confuse the sound of venting cells with transformer buzz on your charger. From a distance they can sound the same, but if you listen carefully transformer buzz is actually a high pitch buzzing noise that comes from the charger, not the pffffffftt sound of a venting cell. My chargers quite often have transformer buzz, and it comes and goes depending on where they are in the cycle.
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