john stones 1 - Moderator Posted June 26, 2018 Share Posted June 26, 2018 My lipos have gone, been left fully charged I think is the reason, want them for my slick 3D. Don't really understand them when I buy, would these Multi Star ones be O.K described as multi rotor lipos...why is that ? also it says hi voltage, does that cause me a problem ? Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted June 26, 2018 Share Posted June 26, 2018 Your biggest problem is that they're only 10C, ie they are rated for low current use over a longer period than the average airoplane would use. Try looking at the Zippy Compacts, they seem to be ok for fixed wing. Get the highest C rating that you can fit and afford! Quote Link to comment Share on other sites More sharing options...
Former Member Posted June 26, 2018 Share Posted June 26, 2018 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Former Member Posted June 26, 2018 Share Posted June 26, 2018 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Allan Bennett Posted June 26, 2018 Share Posted June 26, 2018 Is this the aircraft you're talking about, or is there a larger version? This one only calls for 3S LiPo in the range 1800 to 2200mAh. 4S (higher voltage) may damage the electronics, and the weight of a 4000mAh capacity battery will probably mess up the c of g. High-voltage LiPos can be charged up to a slightly higher voltage than the normal 4.20v, so can store a bit more energy than 'normal' ones. But they can also be charged on a 'normal' LiPo balance charger to only 4.20v, and all that means is that you're foregoing the potential extra energy, but they will have a longer life. As others have suggested, you should normally be looking for something in excess of 20C for a conventional plane or heli. Personally I've become a fan of the standard Turnigy blue LiPos. Quote Link to comment Share on other sites More sharing options...
Martin McIntosh Posted June 26, 2018 Share Posted June 26, 2018 I use Multistar 4S 1400 40-80c rating on my competition E-slot glider and have nothing but praise for them. I always return them to storage charge level between competitions Quote Link to comment Share on other sites More sharing options...
Brian Hammond Posted June 26, 2018 Share Posted June 26, 2018 Graphene lipos are superb,I'me using 65c ones and keeping a record of use and so far they are still like new. Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted June 26, 2018 Author Share Posted June 26, 2018 Posted by Allan Bennett on 26/06/2018 20:08:56: Is this the aircraft you're talking about, or is there a larger version? This one only calls for 3S LiPo in the range 1800 to 2200mAh. 4S (higher voltage) may damage the electronics, and the weight of a 4000mAh capacity battery will probably mess up the c of g. High-voltage LiPos can be charged up to a slightly higher voltage than the normal 4.20v, so can store a bit more energy than 'normal' ones. But they can also be charged on a 'normal' LiPo balance charger to only 4.20v, and all that means is that you're foregoing the potential extra energy, but they will have a longer life. As others have suggested, you should normally be looking for something in excess of 20C for a conventional plane or heli. Personally I've become a fan of the standard Turnigy blue LiPos. No it's the H.K one Alan. Thanks all, still pondering. Quote Link to comment Share on other sites More sharing options...
MattyB Posted June 28, 2018 Share Posted June 28, 2018 Don’t forget that 95% of C ratings are made up - manufacturers are in a war to get your attention, and with few consumers having the kit or knowledge to calculate the real values they can print what they want. A fair rule of thumb is to halve the C rating printed on the side and consider that the maximum constant C rating - if that can meet the needs of your powertrain at WOT you are good. Quote Link to comment Share on other sites More sharing options...
Tom Gaskin 1 Posted June 28, 2018 Share Posted June 28, 2018 I agree with MattyB, although I use 60% as the constant. I also use this rating for my esc's as well. If they're not working too hard, they'll last that much longer 😀 Tom Quote Link to comment Share on other sites More sharing options...
Nigel R Posted June 28, 2018 Share Posted June 28, 2018 Everything MattyB said. There is no consistent meaning to the C rating, what happens at its C max rating? Slight voltage dip? Large voltage dip? Fire? Halve the rating and go with that number. Turnigy Blue seem to offer excellent value. I've had good results from Zippy Compact and Rhino packs too. I have a couple of Overlander Lipos. They don't appear to offer anything the HK lipos don't, except a bigger dint in your wallet. The Slick 360 page on Hobbyking suggests a 4S 2200 - 2650mAh. I would suggest https://hobbyking.com/en_us/zippy-compact-2700mah-4s-35c-lipo-pack.html Quote Link to comment Share on other sites More sharing options...
MattyB Posted June 28, 2018 Share Posted June 28, 2018 If you want to estimate the real world C rating of your lipos measure the IR using your charger or an IT meter and input the values into this calculator - very handy. Be prepared to be shocked by the results though...! Quote Link to comment Share on other sites More sharing options...
Geoff S Posted June 28, 2018 Share Posted June 28, 2018 Posted by MattyB on 28/06/2018 15:02:50: Don’t forget that 95% of C ratings are made up - manufacturers are in a war to get your attention, and with few consumers having the kit or knowledge to calculate the real values they can print what they want. A fair rule of thumb is to halve the C rating printed on the side and consider that the maximum constant C rating - if that can meet the needs of your powertrain at WOT you are good. I think halving C ratings is stretching it a touch. I use Fluoron 4S 4AH LiPos and I received a pair yesterday morning. I checked them both on my Wayne Giles esr meter and both were rated at a C of 20 rather than the quoted 25. That's fine with me as I'm nowhere near needing to draw 80 amps. Incidentally the esr for each cell is less than 4milli ohms and they seem to get better with age as evidenced by my older examples. Geoff Quote Link to comment Share on other sites More sharing options...
MattyB Posted June 28, 2018 Share Posted June 28, 2018 Maybe for low C rated packs a 50% estimate like that it is conservative, but try it for a 40 or 70C pack... Quote Link to comment Share on other sites More sharing options...
Brian Hammond Posted March 28, 2019 Share Posted March 28, 2019 Has anyone tried Fleuron lipos ,they are very cheap on EBay? Quote Link to comment Share on other sites More sharing options...
Colin Carpenter Posted March 28, 2019 Share Posted March 28, 2019 Got a few in use in my club. So far so good for normal flying . Colin Quote Link to comment Share on other sites More sharing options...
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