I read in the June 2010 Ampeer the discussion on using older AstroFlight motors with newer battery technology. Lithium Battery Low Voltage Cutoff (LVC) for Brushed Electronic Speed Controls (ESC)? I wanted to share this vendor with you and your readers and was curious if you had any feedback I have not bought from them yet. They also offer the "iCharger" and other accessories. I came across this "E -Vendor" ( ) named "EP Buddy" that offers reasonably priced "A123" packs ( /index.php?main_page=index&cPath=7) that appear to be well constructed ( /index.php?main_page=page&id=2). Keep up the good work I look forward to every issue.Īs I'm considering upgrading my "fuel tanks" from NiCad to either Li-Poly or LiFePO 4. Not much building time these days, as there is too much outside stuff, and some flying of course. I have a Gordon Whitehead 1/5 Tiger Moth on the table, about 2/3 finished, and hope to fly it by fall. There is nothing nicer in the air than a good biplane. So far, I am very satisfied, and I love the safety factor.Īll my of my cells came via the DEWALT route, and have not had a dud yet.Ĭongratulations on the successful test flights on the Stearman. For the 4 or 6 cell packs, I use an Astro 112D and 112 Deluxe, with "dapters" in the circuit, driven by a 55 amp RV power converter/Honda generator, or right off the van battery, and for 8 cell and up, a MasTec power supply, running off the Honda. As an aside, I use a couple of different charging methods for my "A123" packs, depending on cell count. I have made the switch, and am gradually running down my old packs as they reach the end of their usefulness. I really enjoyed your "conversation" with Jeff regarding converting from NiCad/NiMH cells to "A123" 2300mAh cells. Thanks for another very interesting issue of Ampeer. Weight should be similar, as I have been using a 1500 Li-Poly pack. I do want to try the "flapper" on 3 "A123" cells, as the 3 Li-Poly cells drive the motor much harder than the bird can use. Only the Folkerts needs the Li-Poly pack due to space limitations. When those Li-Poly packs go I will replace them with "A123". Right now ALL of my fleet is "A123" (2300mAh or 1100mAh), except for the King Crimson (I need the Nicad pack weight for balance!), the Bugatti, CzechMate, Jungmann, Folkerts, and the ornithopter. Quite acceptable self-discharge characteristics. When I checked them, the FMA charger either showed 100% full, or went immediately to "Balance" and shut off after adding about 20mAh. I have since flown many "radio test flights" with it and the pack is performing as well as it did when it was put into the plane in 2006!Īs an experiment, I left all of my "A123" packs fully charged last fall. I was amazed! Before the first flight I did a "top off" charge/balance using my FMAdirect CellPro 10S set to Li-Po store. I got it down to set up the new receiver in it and checked the voltages of each cell. The fuselage, with the 6S "A123" 2300mAh pack, had hung in my basement for over a year.
I did not fly it at all in 2009, not one flight. I wanted to use my Flite 40 to do some radio testing. (5C is 12 minutes for those who have a hard time with the notion of C rates.) I just find that, for me, these are the cells that I use the most. I want to make it clear that I do NOT believe that the cells from A123 Systems are the be all and end all of battery technology for electric flight! There are many very valid and excellent reasons to use Li-Poly batteries, especially now that they can be charged at 5C rates. Some Current Information on "A123" 2300mAh Cells Mailed Ampeer subscriptions are no longer availableĭate: Sat. The Club Newsletter of the Electric Flyers Only, Inc
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