Rc-Bfg Posted June 17, 2015 Share Posted June 17, 2015 The low voltage thing on the esc wat do ya recomend to have it on. So battery wint dip below a certain viltage per cell. Dont wanna screw them up. Had a run tonight and the thung is quick Quote Link to comment Share on other sites More sharing options...
capri-boy Posted June 17, 2015 Share Posted June 17, 2015 The low voltage thing on the esc wat do ya recomend to have it on. So battery wint dip below a certain viltage per cell. Dont wanna screw them up. Had a run tonight and the thung is quick It depends on your esc. I have 3.2 set on my HW esc's as they tend to underead, and come off a bit higher. Rarely hit lvc on the big packs though as always tend to overestimate how many packs I'll need so end up running them all a bit to get them aroundunder storage level. Quote Link to comment Share on other sites More sharing options...
Rc-Bfg Posted June 17, 2015 Share Posted June 17, 2015 http://www.modelsport.co.uk/hobbywing-quicrun-wp8bl150-bl-esc/rc-car-products/382834 This is fitted in it. Quote Link to comment Share on other sites More sharing options...
gigeogre Posted August 16, 2015 Share Posted August 16, 2015 So it would seem my losi ten scte's esc is gobbling (going below the min 3v) and eating my batterys - not good ! 3 turnigy 3s all have 3v per cell in one bank and the other bank, 0 . Quote Link to comment Share on other sites More sharing options...
suicideneil Posted August 16, 2015 Share Posted August 16, 2015 So it would seem my losi ten scte's esc is gobbling (going below the min 3v) and eating my batterys - not good ! 3 turnigy 3s all have 3v per cell in one bank and the other bank, 0 . Get yourself a lipo alarm if the esc's Lvc isn't working properly ( I'm assuming you have it turned on, or there is one )... Quote Link to comment Share on other sites More sharing options...
gigeogre Posted August 16, 2015 Share Posted August 16, 2015 Get yourself a lipo alarm if the esc's Lvc isn't working properly ( I'm assuming you have it turned on, or there is one )... Yeah, it should be on - checked it was on with the usb adaptor... Hmm Quote Link to comment Share on other sites More sharing options...
mism Posted August 27, 2015 Share Posted August 27, 2015 I've read lots about LiPo batteries in preparation for using them for the first time, hopefully tomorrow. This thread as well as http://www.rctech.net/articles/tech/everything-you-need-to-know-about-electric-power-part-3-li-po-batteries/ and http://www.robotwars.00server.com/tutorials.html were all very useful. Am I correct in thinking that: Charging incorrectly (giving the charger the wrong information, trying to charge too quickly etc) is the main cause of LiPo fires? Drawing more power than the battery can supply can cause a fire. Everything else such as letting the battery voltage get too low or leaving it fully charged for weeks at a time will damage or ruin the battery but it won't start a fire? I don't plan on doing any of those things I'm just trying to establish when I should be most paranoid. I'll have a LiPo sack and was thinking of placing the battery in that (bear with me here!) on the glass plate in an unplugged microwave. That way if it went tits up I can pull the plug and shut the door. Am I mental? Quote Link to comment Share on other sites More sharing options...
turok007 Posted August 27, 2015 Share Posted August 27, 2015 most fires happen when using them many people pull to many A or go below 3V per cell. Quote Link to comment Share on other sites More sharing options...
Deafty Posted August 27, 2015 Share Posted August 27, 2015 Thats a suitable storage location, albeit uncommon I am most concerned when a lipo swells. Though as of yet no fire. My biggest concern is having them punctured by something, that tends to cause fire pretty quickly Quote Link to comment Share on other sites More sharing options...
suicideneil Posted August 28, 2015 Share Posted August 28, 2015 Pulling way too much current for too long ( leading to the lipos overheating, swelling, then flaming up... ) and physical damage are the main things to avoid- make sure the battery tray on your model has no sharp edges or screws sticking into it, and no moving parts directly next to or over/under it which might snag the lipo. Provided the pack has a sufficient spec for your models needs, you should be fine otherwise. 1 Quote Link to comment Share on other sites More sharing options...
mism Posted August 28, 2015 Share Posted August 28, 2015 Thanks guys. Quote Link to comment Share on other sites More sharing options...
Tamiyacowboy Posted August 28, 2015 Share Posted August 28, 2015 Fire is not common as people think. but there is a danger when miss treated. we the forum members must take into account some folks may not look after electrical items like they need to be. this is why we go on about battery care so much. Overheat: or a thermal runaway , this is when the batterys chemistry becomes unstable , if the battery becomes to hot it can start to run away, ie the battery heat up more and more until it cannot be contained in its sealing wrapper. Damage: if the foil is cut/split/ hard dented it can cause a short inside the battery, this leads to the battery puffing up and.or a overheat runaway. undercharge - overcharge !!!!!!!!! this is where you be careful, you MUST stop using the battery when it reaches a certain voltage, if it drains to much the chemisty can become unstable and lead to overheat. YOU MUST NEVER leave the battery alone to charge, you must always keep an eye on it. chargers are smart but sometimes even they fail. so keep an eye on it when charging. do this NOT on your bedroom floor but chose a solid area like concrete floor or likes and if possible a lipo charge/storage bag ( will help contain any fire if something happens. LIPO ALARM !!! this device is cheap but its the best way to warn you if something is wrong when the battery is inside your car. it will beep a warning if the battery gets to low on power - and will give you a full voltage reading and a seperate each cell voltage reading. Quote Link to comment Share on other sites More sharing options...
mism Posted August 28, 2015 Share Posted August 28, 2015 (edited) Thanks Tamiyacowboy. Some people seem happy to rely on their ESC's low voltage cut off while others like the security of a LiPo alarm. They aren't expensive though, is this the right kind of thing: http://www.hobbyking.co.uk/hobbyking/store/__62904__HobbyKing_8482_Cellmeter_6_Lipo_Life_Li_ion_Cell_Checker_Alarm_UK_Warehouse_.html It just plugs into the battery's balance lead I think? Edited August 28, 2015 by mism Quote Link to comment Share on other sites More sharing options...
Tamiyacowboy Posted August 28, 2015 Share Posted August 28, 2015 (edited) yeah thats one. there are lots of different types on market but they all do one thing in common. read voltage and warn when a set limit is reached. and when we say warn, its not a low'ish bleep, its a high pitched beep beep your able to hear it even when the car is bombing along. Most do rely on the esc to cut out, but problem is an esc is an electronic brain and brains can fall over, and or forget things. the lipo alarm-meter is more a second self defence mode , if that goes of and your esc has not cut out something needs looking at, maybe esc is programmed wrong or its starting to show wear and tear. the lipo meter/alarm also acts like a mini volt meter. mine reads upto 8s im sure, so its able to read off my 12v car battery no problem on its full voltage. but when plugged into a balance lead on the lipo batterys its shows lots more info to the user. now most have FQA's can we use the lipo alarm even when our battery is in the car and hooked to the esc . and is it the balance lead we use ? "hell yeah, thats the best way to have them set up, in the car. balance lead plugs into your alarm and you tuck it out the way" can the meter tell me is my battery is faulty.? what is the best cutoff value to have and/or use ? " Well i myself run a 3.7v cutoff most esc's will cut out at around this voltage some at 3.8v. as a good thing i would say to look after your batterys and have them last longer use a cutoff value between 3.6v and 3.8v . if you wish to risk a little drop down to 3.4v 3.5v but be warned it may make your batterys last a little less longer over time. yes but its not a wrote message, more so the voltage, it tells you the total voltage like 8.4v fully charged 2s lipo , and then cycles and says c1 4.2 c2 4.2 ........... some will have a c1 others may not have any just each cells voltage one after the other but all the same its saying the voltage of the total battery and each little pocket cell inside the whole battery. Edited August 28, 2015 by Tamiyacowboy Quote Link to comment Share on other sites More sharing options...
mism Posted August 29, 2015 Share Posted August 29, 2015 Thanks again Tamiyacowboy. On a related note: imagine I storage charge my LiPo then put it in it's bag and leave it in a cupboard and never use it again. Will anything dangerous happen or will it just degrade and puff up. Quote Link to comment Share on other sites More sharing options...
suicideneil Posted August 30, 2015 Share Posted August 30, 2015 just degrade and puff up. ^That. The voltage still drops on its own over long periods of time, eventually it'll just puff and one or more cells will read zero volts. Best practice when it comes to storing lipos for long periods is to take them out, check the cell voltages and do a discharge>charge cycle once every few months, to keep them 'fresh'. Quote Link to comment Share on other sites More sharing options...
evssv Posted September 2, 2015 Share Posted September 2, 2015 and always strap em in good n tight...chk..then chk again...as a spur spinning at xxx rpm's will munch through one in a blink....and then u could have problems. ... Quote Link to comment Share on other sites More sharing options...
Teasy Posted November 11, 2015 Share Posted November 11, 2015 (edited) Hi, I'm very knew to RC and of course this forum and I have a quick question. I currently use 5000mAh 5s LiPo batteries. However I've seen a great deal on some 5200mAh 6s LiPo batteries, considerably cheaper than I have been paying for my 5s batteries.What I was wondering is this, if I bought some of these 6s batteries would it be possible to turn them into 5200mAh 5s batteries? Edited November 11, 2015 by Teasy Quote Link to comment Share on other sites More sharing options...
Skiing Monkey Posted December 7, 2015 Share Posted December 7, 2015 (edited) Help please ! Now returning back to the r/c game, I have the same dilemma as some others about these Lipo batteries. I have a Hornet with the 540 motor (Tamiya stock) in it and a TEU-105bk ESC in it, but doesnt run for very long with a 7.2v Battery. Firstly , is it ok to use a lipo battery on it? If i use a lipo battery on it, would this improve on time and speed. AND which one would be best to use please. Looking to get a Dark Impact soon too, so will need to know for this too. Thank you for your time a patience. Edited December 7, 2015 by Skiing Monkey Quote Link to comment Share on other sites More sharing options...
Noj Posted December 7, 2015 Share Posted December 7, 2015 Yes, you can run a 2s lipo through that ESC but you must use a separate lipo alarm as the esc does not have an lvc function. Runtime and performance will improve. 1 Quote Link to comment Share on other sites More sharing options...
Skiing Monkey Posted December 7, 2015 Share Posted December 7, 2015 (edited) It did state on it that it has a Low voltage cut off, and when the 7.2 dies , it does cut out before slowing to crawling. Is this ok, or do i still need a Lipo alarm ?? Edited December 7, 2015 by Skiing Monkey Quote Link to comment Share on other sites More sharing options...
Noj Posted December 7, 2015 Share Posted December 7, 2015 You need a lipo alarm, the teu105 does not have a lipo specific lvc. Cells should come off at 3.4v each (running them down further gives no real benefit to runtime) 1 Quote Link to comment Share on other sites More sharing options...
Skiing Monkey Posted December 7, 2015 Share Posted December 7, 2015 Cool. Super help !! Quote Link to comment Share on other sites More sharing options...
FatWheels Posted December 8, 2015 Share Posted December 8, 2015 Ordered my Xmaxx and some 8400 lipos. I have Nimh cells for my other truck and am familiar with nitro trucks first adventures with Lipo power. do I need boxes and bags to store them and charge them in? Quote Link to comment Share on other sites More sharing options...
granty Posted April 27, 2016 Share Posted April 27, 2016 Hi there, I have just brought this: https://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=82842 I am a little confused. Should I set the ampage on the charger to match the MAH on the pack so if I have 5800mah battery, set the charger to 5.8a? Same for storage mode? I'm just confused if so, whats the point of having 20a as surely there's no batteries big enough? How do I know if the charger is charging at 1c, 2c, 3c etc? On my old charger, when I used storage mode, the highest I could do is 1.0a which is what is really throwing me here. Quote Link to comment Share on other sites More sharing options...
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