groome1 Posted October 19, 2012 Share Posted October 19, 2012 (edited) Newb question. If I was to run 2x2s In parallel how would it effect the mah and c ratings and how would it be effected in series? Also would they have to be the same mah Anschluss ratings or can this be different and not cause any problems? Edited October 19, 2012 by groome1 Quote Link to comment Share on other sites More sharing options...
Joe Bailey Posted October 20, 2012 Share Posted October 20, 2012 If you connect Battery's in Parallel you Double the Mah of the pack and the voltage remains the same, Eg, if you take Two 2s1p 3000 mah 30C packs and connect them in parallel you get a 2s2p 6000mah 30c pack. Hope that helps. Quote Link to comment Share on other sites More sharing options...
suicideneil Posted October 27, 2012 Share Posted October 27, 2012 Newb question. If I was to run 2x2s In parallel how would it effect the mah and c ratings and how would it be effected in series? Also would they have to be the same mah Anschluss ratings or can this be different and not cause any problems? They do need to be 100% identical, same mah, same C rating, same voltage, same brand, same age & condition. If you need more runtime, buy larger capacity lipos, unless you have a massive chassis and don't need the higher voltage from running 2 packs in series instead... Quote Link to comment Share on other sites More sharing options...
barnetbasher Posted November 12, 2012 Share Posted November 12, 2012 Hey folks... Though I would post this up in this section so it can be useful info once someone answers it... i bought a 2ndhand 3s from a forum member...but it seems to have one cell reading 2.4 volts... I would like to know if it is possible to do anything to revive it...as I believe the seller when he says it was fine when he had it.... he has offered a refund but i want to make sure there is no way it can be rectified. Quote Link to comment Share on other sites More sharing options...
ianthomas425 Posted November 16, 2012 Share Posted November 16, 2012 Newbie question here My new esc has a lipo cut off and lets me set it to what ever i want which will be 3.2v My question is do i program the esc to cut off at 3.2v or 6.4v for a 2s lipo ?? Quote Link to comment Share on other sites More sharing options...
Joe Bailey Posted November 16, 2012 Share Posted November 16, 2012 Read the instructions first, if it sets the voltage per cell then set it to 3.2 if it's total pack voltage then set it to 6.4. If your racing with hot motors set it to 3v. You don't want to run until LVC but stop before it. Quote Link to comment Share on other sites More sharing options...
andysrcmodel Posted December 11, 2012 Share Posted December 11, 2012 My question is basically I know I be good with 3s lipo , 5000 , can some off you post me a link to a few privately pm me Turnigy I think name is on eBay which 1 out off a couple . Cheers Quote Link to comment Share on other sites More sharing options...
graykody Posted March 1, 2013 Share Posted March 1, 2013 New to lipos and have just ordered this charger http://www.modelsport.co.uk/orion-advantage-iq240-2s-3s-lipo-charger/rc-car-products/36402 And these batteries for this http://www.modelsport.co.uk/vaterra-kalahari-4wd-desert-raider-rtr/rc-car-products/372836 http://www.modelsport.co.uk/orion-advantage-iq240-2s-3s-lipo-charger/rc-car-products/36402 Also ordered a lipo safe bag with the charger, is the charger ok? Not fussed if it takes 30 mins or 4hours to charge but I will be charging in the house and just want to be safe while doing so Also if I buy an ec3 to traxxas connector could I use the lipos in my Stampede xl5 brushed or am I safer buying a lipo that already has a traxxas connector on it? Thanks for any help Quote Link to comment Share on other sites More sharing options...
suicideneil Posted March 3, 2013 Share Posted March 3, 2013 New to lipos and have just ordered this charger http://www.modelspor...-products/36402 And these batteries for this http://www.modelspor...products/372836 http://www.modelspor...-products/36402 Also ordered a lipo safe bag with the charger, is the charger ok? Not fussed if it takes 30 mins or 4hours to charge but I will be charging in the house and just want to be safe while doing so Also if I buy an ec3 to traxxas connector could I use the lipos in my Stampede xl5 brushed or am I safer buying a lipo that already has a traxxas connector on it? Thanks for any help That's an insult to lipo chargers to call it one, but it will indeed work fine ( no advanced features so if you ever have issues you'll need a proper ~ Quote Link to comment Share on other sites More sharing options...
Tamiyacowboy Posted March 18, 2013 Share Posted March 18, 2013 higher the cutoff value the better it is for your lipos. less undue stress is put on the chemical makeup of cell etc etc as a rule of thumb i try and keep my cutoff point at around 3.5v -3.8v for each cell. any lower than 3v and your frying the cell ( chemicals become unstable start to release gas) , not every lipo tester lvc etc etc are very good. they are an indicator not to be trusted but as a guide. same goes with charging no more than 4.2V anything higher will start a chemical reaction i would say 3.5v for each cell, this way it keeps them in good condition, and it is fairly close to the 3.8v per cell storage voltage. lipos are not as beefy as nimhs and require care and careful charging. Quote Link to comment Share on other sites More sharing options...
suicideneil Posted March 20, 2013 Share Posted March 20, 2013 higher the cutoff value the better it is for your lipos. less undue stress is put on the chemical makeup of cell etc etc as a rule of thumb i try and keep my cutoff point at around 3.5v -3.8v for each cell. any lower than 3v and your frying the cell ( chemicals become unstable start to release gas) , not every lipo tester lvc etc etc are very good. they are an indicator not to be trusted but as a guide. same goes with charging no more than 4.2V anything higher will start a chemical reaction i would say 3.5v for each cell, this way it keeps them in good condition, and it is fairly close to the 3.8v per cell storage voltage. lipos are not as beefy as nimhs and require care and careful charging. Baring in mind storage voltage is 50% charge/capacity, setting the cutoff for 3.5v means you are only able to use around ~60-70% of the total capacity which is seriously shortening the potential runtime for no good reason. 80% discharge is the industry norm which equates to 3.2-3.4v per cell and has been what is recommended for years. Below this the voltage level drops off sharply so setting the LVC any lower than 3.2v is certainly nto a good idea, but setting it much higher is just wasting runtime ( also bare in mind plenty of packs have been saved when the voltage dropped down as low as ~2.5v, so lipos aren't quite as fragile as nimhs which them selves are very easy to destroy by running too low as well & often only have a couple dozen uses before professional racers relegate them to practice use only...). Quote Link to comment Share on other sites More sharing options...
chester-lad Posted April 1, 2013 Share Posted April 1, 2013 New to lipos and have just ordered this chargerhttp://www.modelsport.co.uk/orion-advantage-iq240-2s-3s-lipo-charger/rc-car-products/36402 And these batteries for this http://www.modelsport.co.uk/vaterra-kalahari-4wd-desert-raider-rtr/rc-car-products/372836http://www.modelsport.co.uk/orion-advantage-iq240-2s-3s-lipo-charger/rc-car-products/36402 Also ordered a lipo safe bag with the charger, is the charger ok? Not fussed if it takes 30 mins or 4hours to charge but I will be charging in the house and just want to be safe while doing so Also if I buy an ec3 to traxxas connector could I use the lipos in my Stampede xl5 brushed or am I safer buying a lipo that already has a traxxas connector on it? Thanks for any help That charger you put a link up for if you buy it chuck cable away that plug has no fuse i.n it Quote Link to comment Share on other sites More sharing options...
savagejoe Posted April 17, 2013 Share Posted April 17, 2013 hi jyst recieved some second hand lipos and the 2s lipos seem to have 8.4v instead off 7.4v which is staded on the battery. should i be worried about this? thanks joe Quote Link to comment Share on other sites More sharing options...
suicideneil Posted April 17, 2013 Share Posted April 17, 2013 hi jyst recieved some second hand lipos and the 2s lipos seem to have 8.4v instead off 7.4v which is staded on the battery. should i be worried about this? thanks joe Noob. Lipos are 4.2v per cell fully charged, 3.7v is the nominal voltage ( ~half charged ), and ~3.2v discharged ( or, set or LVC to this voltage if it is adjustable- don't ask what an LVC is or I will cry.... ). A 2s lipo will therefore be 8.4v fully charged, so nothing to worry about. To learn about lipos and chargers / charging, click the Tutorials link in my sig and read the Lipo chargers & charging section, along with the lipo battery section to get yourself upto speed. Quote Link to comment Share on other sites More sharing options...
Marv968 Posted May 26, 2013 Share Posted May 26, 2013 Quick question if you don't mind - I've started using a lipo battery and I'm using a buzzer to tell me when the voltage has dropped to 3.3 volts (Just as a stop gap before getting an ESC with a LVC) However, once the voltage gets to around 3.5 volts, after a short time, the buzzer will go off - I think when I'm punching the power down, the voltage is dropping below 3.3 temporarily, then by the time I've got to it to look at, the voltage has levelled back to about 3.5. Does this sound correct? I've stopped using the car as soon as the buzzer has gone off and re-balance charged it, just to err on the side of caution - but should I carry on until the voltage actually properly drops to 3.3, just not keep pushing the trigger down so hard? Quote Link to comment Share on other sites More sharing options...
suicideneil Posted May 26, 2013 Share Posted May 26, 2013 Quick question if you don't mind - I've started using a lipo battery and I'm using a buzzer to tell me when the voltage has dropped to 3.3 volts (Just as a stop gap before getting an ESC with a LVC) However, once the voltage gets to around 3.5 volts, after a short time, the buzzer will go off - I think when I'm punching the power down, the voltage is dropping below 3.3 temporarily, then by the time I've got to it to look at, the voltage has levelled back to about 3.5. Does this sound correct? I've stopped using the car as soon as the buzzer has gone off and re-balance charged it, just to err on the side of caution - but should I carry on until the voltage actually properly drops to 3.3, just not keep pushing the trigger down so hard? Perfectly normal, voltage will dip lower when pushing it hard(er). I would just say to go easier on the throttle when the buzzer starts to go off, will extend the run time a few more minutes. Mashing the throttle isn't th best idea no matter what as that's how to heat up the electronics faster and damage the drive-train.... Quote Link to comment Share on other sites More sharing options...
Marv968 Posted May 27, 2013 Share Posted May 27, 2013 Cheers Neil! I'll feed in the power a bit more smoothly now then! Quote Link to comment Share on other sites More sharing options...
Vr5fx Posted July 4, 2013 Share Posted July 4, 2013 What is the acceptable "off balance" in a LiPo? I have myself a few LiPo batteries, but my 3s seems to have a cell quite out on balance charge. It's taken about 5 charges, and today it has finished charge with the cells at: 4.194 4.191 4.174 Battery is a Turnigy 5.0 3s charged at 4a (max current for charger) with the balance board connected. Quote Link to comment Share on other sites More sharing options...
suicideneil Posted July 5, 2013 Share Posted July 5, 2013 What is the acceptable "off balance" in a LiPo? I have myself a few LiPo batteries, but my 3s seems to have a cell quite out on balance charge. It's taken about 5 charges, and today it has finished charge with the cells at: 4.194 4.191 4.174 Battery is a Turnigy 5.0 3s charged at 4a (max current for charger) with the balance board connected. Generally speaking, +/- 0.02v is fine- you have to bear in mind that chargers themselves aren't always 100% accurate in terms of the voltages they read ( calibration may or may not be done precisely with high end Quote Link to comment Share on other sites More sharing options...
madnickuk Posted July 18, 2013 Share Posted July 18, 2013 Ok so maybe i'm being a bit thick, but I just cant work out what lipo to buy for this. http://www.modelsport.co.uk/?product_id=34310 its going in a 4wd 1/10 buggy, help ?? Quote Link to comment Share on other sites More sharing options...
suicideneil Posted July 20, 2013 Share Posted July 20, 2013 Ok so maybe i'm being a bit thick, but I just cant work out what lipo to buy for this. http://www.modelsport.co.uk/?product_id=34310 its going in a 4wd 1/10 buggy, help ?? 2s ( 7.4v ) lipo, anything around ~3500-5000mah & rated for 30C or higher ( continuous ). Check dimensions on lipos vs your buggy though, otherwise the lipo may be too wide or long to fit the battery tray.. 1 Quote Link to comment Share on other sites More sharing options...
cameronuk Posted August 5, 2013 Share Posted August 5, 2013 So I've just upgraded to this set up:http://www.modelsport.co.uk/etronix-photon-2.0-1-10-brushless-system-12.0r/rc-car-products/368727 Niw I'm looking to go lipo, what are the downsides of getting a 3s 11.1v rather than a 2s 7.4v? Would it damage anything? Is it designed for 3s? I've been looking at this one:http://www.modelsport.co.uk/overlander-sport-11.1v-5000mah-30c-lipo-pack-no-con.-/rc-car-products/377046 Can you tell me if this would be suitable for an upgrade in battery time and also speed? Thanks Quote Link to comment Share on other sites More sharing options...
suicideneil Posted August 5, 2013 Share Posted August 5, 2013 So I've just upgraded to this set up:http://www.modelsport.co.uk/etronix-photon-2.0-1-10-brushless-system-12.0r/rc-car-products/368727 Niw I'm looking to go lipo, what are the downsides of getting a 3s 11.1v rather than a 2s 7.4v? Would it damage anything? Is it designed for 3s? I've been looking at this one:http://www.modelsport.co.uk/overlander-sport-11.1v-5000mah-30c-lipo-pack-no-con.-/rc-car-products/377046 Can you tell me if this would be suitable for an upgrade in battery time and also speed? Thanks Read the spec of the esc & motor on that page- it actually tells you they are rated for upto 3s lipo. Nothing will be damaged by running 3s as such, but expect higher temps / possible overheating if you don't alter gearing ( higher voltage = gear down ). Not sure how durable the carnage is so do some research into what other guys run with it. Runtime and speed with be more than fine with that lipo, though there are better value options about ( there are ten billion threads asking about lipo choices- a quick search is all it takes.. )- depends if you want to order from inside the UK and get faster postage, or if you don't mind ordering from overseas ( hobbyking have a UK warehouse but postage speed & stock levels aren't always great )... Quote Link to comment Share on other sites More sharing options...
cameronuk Posted August 5, 2013 Share Posted August 5, 2013 Read the spec of the esc & motor on that page- it actually tells you they are rated for upto 3s lipo. Nothing will be damaged by running 3s as such, but expect higher temps / possible overheating if you don't alter gearing ( higher voltage = gear down ). Not sure how durable the carnage is so do some research into what other guys run with it. Runtime and speed with be more than fine with that lipo, though there are better value options about ( there are ten billion threads asking about lipo choices- a quick search is all it takes.. )- depends if you want to order from inside the UK and get faster postage, or if you don't mind ordering from overseas ( hobbyking have a UK warehouse but postage speed & stock levels aren't always great )... When u say gear down, I have a 17t pinion gear at the moment, what would u recommend changing it to if I get 3s lipo? Quote Link to comment Share on other sites More sharing options...
suicideneil Posted August 5, 2013 Share Posted August 5, 2013 When u say gear down, I have a 17t pinion gear at the moment, what would u recommend changing it to if I get 3s lipo? That's why you need to do some research; I don't own that model, so I can't recommend specific or ideal gearing- it's just a general rule of thumb ( higher voltage / kv rating on the motor needs lower gearing to keep temps in check ). Quote Link to comment Share on other sites More sharing options...
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