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Model Forum / Radio Controlled / Helicopters / September 2008LiPo question
The Blade 400 I fly has a shutdown feature for when the battery runs too low. Simple question, is it good/bad for the battery to run it to that point? Or should I stop much sooner? Brian  Signaturehttp://www.skywise711.com - Lasers, Seismology, Astronomy, Skepticism Seismic FAQ: http://www.skywise711.com/SeismicFAQ/SeismicFAQ.html Quake "predictions": http://www.skywise711.com/quakes/EQDB/index.html Sed quis custodiet ipsos Custodes? > The Blade 400 I fly has a shutdown feature for when the battery > runs too low. > Simple question, is it good/bad for the battery to run it to > that point? Or should I stop much sooner? As even the manual advises not to use the limiter feature and people in web-based boards also say so, I'd say better stop sooner. CU, Andy Skywise <into@oblivion.nothing.com> wrote in news:Dzmqk.20102$ah4.15600 @newsfe15.ams2: > The Blade 400 I fly has a shutdown feature for when the battery > runs too low. [quoted text clipped - 3 lines] > > Brian As a flyer that has puffed many LiPos I would say do not use the automatic limiter. Get a cheap loud kitchen timer and you will be fine. John ** Posted from http://www.teranews.com ** > Skywise <into@oblivion.nothing.com> wrote in news:Dzmqk.20102$ah4.15600 > @newsfe15.ams2: [quoted text clipped - 12 lines] > John > ** Posted from http://www.teranews.com ** how does a kitchen timer know when to go off?? SignatureKevin R Reply address works | > Skywise <into@oblivion.nothing.com> wrote in news:Dzmqk.20102$ah4.15600 | > @newsfe15.ams2: [quoted text clipped - 13 lines] | > ** Posted from http://www.teranews.com ** | how does a kitchen timer know when to go off?? You set it for the time that you want to allow. How do you know what time to allow? By the average time it took to poof three packs X 90%. ;-} SignatureAnyolmouse ---- Posted via Pronews.com - Premium Corporate Usenet News Provider ---- http://www.pronews.com offers corporate packages that have access to 100,000+ newsgroups > | > Skywise <into@oblivion.nothing.com> wrote in > news:Dzmqk.20102$ah4.15600 [quoted text clipped - 19 lines] > time to allow? By the average time it took to poof three packs X 90%. > ;-} thats ok if you remember to charge them first :-) (I was being an devils advocate) this is exactly what I normally do, but I use the built in timer on my Futaba 9C thats set with the throttle channel and I set it to go off roughly 90% discharged, I have still puffed packs but I have carried on using them and they seem fine SignatureKevin R Reply address works > | > Skywise <into@oblivion.nothing.com> wrote in > news:Dzmqk.20102$ah4.15600 [quoted text clipped - 19 lines] > time to allow? By the average time it took to poof three packs X 90%. > ;-} so to find the correct time you have to poof 3 packs. Thats going to get very expensive. There must be a better way ? >> | > Skywise <into@oblivion.nothing.com> wrote in >> news:Dzmqk.20102$ah4.15600 [quoted text clipped - 25 lines] > so to find the correct time you have to poof 3 packs. Thats going to > get very expensive. There must be a better way ? fly for 2 mins, charge the pack see how much it discharged then work out how many minutes to discharge the pack then set the timer at 90% of that time SignatureKevin R Reply address works >so to find the correct time you have to poof 3 packs. Thats going to >get very expensive. There must be a better way ? Get a charger that can display how many mah it takes to recharge the pack fully. Fully charge a pack and fly for 3-4 minutes. Recharge and note the mah required to recharge. Figure out the mah/minute discharge rate and adjust the flight time from there. For good pack longevity, set the flight time so you don't exceed 80% of the pack's capacity. For example, if the pack is 2000mah, the most you want to put back is 1600mah when you recharge (2000mah * 0.80 = 1600mah) >>so to find the correct time you have to poof 3 packs. Thats going to >>get very expensive. There must be a better way ? [quoted text clipped - 12 lines] > For example, if the pack is 2000mah, the most you want to put back is > 1600mah when you recharge (2000mah * 0.80 = 1600mah) Those are all well and good, but maybe the guy is a newbie and doesn't have the cash for a good charger? Just use the the 4.5mins timer on the radio initially.... especially as the stock 1800mah pack is not the best > Those are all well and good, but maybe the guy is a newbie and doesn't > have the cash for a good charger? > Just use the the 4.5mins timer on the radio initially.... especially as > the stock 1800mah pack is not the best Noob? yes. Cashless? no. However, I don't fly enough to justify an expensive charger. I have too many hobbies as it is. But what I've done is fly my batteries to the limit using the timer, and now only fly 80% of that. So on the two batteries I've got, that gives me 7 and 10.5 minutes for the flying I do. Brian Signaturehttp://www.skywise711.com - Lasers, Seismology, Astronomy, Skepticism Seismic FAQ: http://www.skywise711.com/SeismicFAQ/SeismicFAQ.html Quake "predictions": http://www.skywise711.com/quakes/EQDB/index.html Sed quis custodiet ipsos Custodes? >> Those are all well and good, but maybe the guy is a newbie and doesn't >> have the cash for a good charger? >> Just use the the 4.5mins timer on the radio initially.... especially as >> the stock 1800mah pack is not the best Not a real good way to maintain your packs... >Noob? yes. Cashless? no. > [quoted text clipped - 6 lines] >So on the two batteries I've got, that gives me 7 and 10.5 minutes >for the flying I do. Good luck getting any longevity out of your packs. How many flights do you get out of your batteries before they die of "old age"? Brian Signaturehttp://www.skywise711.com - Lasers, Seismology, Astronomy, Skepticism Seismic FAQ: http://www.skywise711.com/SeismicFAQ/SeismicFAQ.html Quake "predictions": http://www.skywise711.com/quakes/EQDB/index.html Sed quis custodiet ipsos Custodes? > How many flights do you get out of your batteries before > they die of "old age"? > > Brian Most of the LiPos that die at our club old age is the least of the problems hitting the ground normally kills them :-) and judging by the shape of a pack from a 600 t-rex that fell 100 or so feet they dont seem to burst into flames now either I have had some a year that I use in a T-rex and a Zagi that I have lost count on the number of flights, and one has been puffy for months and its still going strong SignatureKevin R Reply address works >How many flights do you get out of your batteries before >they die of "old age"? Depends on their care and feeding and the quality of the pack from the get-go. I have 6 Thunder Power 3S packs that are over 2 years old and each one of 'em has over 150 cycles on 'em. Yeah, they're getting a bit tired, but they still work. I have 2 6S Flightpower packs with about 100 cycles each that are still going strong. I also have AirThunder 6S and 3S packs and a couple of Outrage 6S packs for my Trex 500 that will get the same treatment as all my other packs and I anticipate long lives out of them as well. |
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