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Model Forum / Radio Controlled / Land Models / November 2003Cheap battery packs
I have 5 Duratrax Pirahna 1900 battery packs, I think they were ~$15 each. For the casual bashing I do, they work pretty well. However, they get hot as hell when I run them. I did read on one website that the battery bars used to assemble these packs are very thin and cheap. It was suggested that just by disassembling a pack and soldering it back together with good battery bars you can increase the performance. What are your thoughts on this? I am wondering if the pack is getting so hot because the bars are getting real hot like little heating elements. Thanks, --Dan dg tried to scribble ... > I have 5 Duratrax Pirahna 1900 battery packs, I think they were ~$15 > each. For the casual bashing I do, they work pretty well. However, [quoted text clipped - 8 lines] > Thanks, > --Dan Many cheap packs have the thin battery bars spot welded to the cell tops and can be awkward to get off cleanly enough to solder thicker bars. I run top of the range packs with top of the range bars, they still get hot .. ;) I still have problems occasionally with an odd battery bar de-soldering, maybe having had a bad joint. Personally, I wouldn't touch a welded bar, it's very unlikely to get hot enough to melt the bar or the weld ..;)  SignatureDigweed '79 Beamish RL 250, '85 Swift Corvette, '95 Dyna-Tech CroMo Comp, '97 Landrover Discovery 300 Tdi, '02 Schumacher CAT 3000, '03 Losi Kinwald Triple-X, '03 Associated RC10 B4 .... ;) >I have 5 Duratrax Pirahna 1900 battery packs, I think they were ~$15 each. >For the casual bashing I do, they work pretty well. However, they get hot [quoted text clipped - 7 lines] >Thanks, >--Dan It's possible that the heat could have to do with those "bars", but there are a few other possibilities. For example, what motor are you using, is it a mod motor(particaularly under 19 turns)? And are you using the Tamiya battery connectors on everything? If so, then that could VERY easily account for a LOT of heat. Those Tamiya connectors are notorious for having high electrical resistance compared to the others available, & if you're also running a mod motor, the extra amp draw those motors have will push things harder, so when you combine high resistance & high amp draw, you get a LOT of heat.... > >I have 5 Duratrax Pirahna 1900 battery packs, I think they were ~$15 each. > >For the casual bashing I do, they work pretty well. However, they get hot [quoted text clipped - 17 lines] > draw those motors have will push things harder, so when you combine > high resistance & high amp draw, you get a LOT of heat.... Or, it sounds to me like your motors might be getting beat and losing magnetic power. Weak magnets allow much more current to go through the motor, and this generates heat at the batteries. It also makes the motor get hot, which kills the magnets further. Heat is DEATH for magnets. I use the 1900 Pirahna packs and they do get warm, but I think it's because the runtimes are pretty long. Run a pack for 5 minutes only and see if it's as warm as if you run it for 8 minutes............... Make sure you don't run a car through the grass. Keep everything cleaned and lubed and good racing to you! DB > > >I have 5 Duratrax Pirahna 1900 battery packs, I think they were ~$15 each. > > >For the casual bashing I do, they work pretty well. However, they get hot [quoted text clipped - 35 lines] > > DB Generaly batteries get hot when charging, and uncharging. depending on how cheap i have noticed i am able to make the shrink tube on the battery back shrink a bit more,and simply not fit any more... i havent noticed any problems with it other then that tho, offcourse, the more heat they cary, the more likely they are to start leaking, or in otherways take some damage.. heat is never "good". i honestly dont know what you could do in your case, i have my battery pack set up in my lazer so that the air has a bit more movement over the batteries now then it had b4, it keeps the temp down a klittle, but i have not really noticed that much of a difference... Im more worried about my fuses and so on, then the actuall battery pack... seams i cant go out and drive any more, without having a spare 10amp fuse with me, for a old orange omega engine, that is a bitt much... Guess i need a new one... *- ) B! |
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