Danny Fenton Posted May 27, 2009 Share Posted May 27, 2009 I think I am just biased, I sha'nt use Lipos for anything greater than a 40 sized model. You are quite right about the price on Hobby City/United Hobbies, when I last looked I hadn't logged in. Anyway including shipping they are still the cheapest, and they have solder tabs. I have bought cells from there before but that was when the exchange rate was better and I have had no problems. So how old is your oldest A123 pack? What capacity does it have? My oldest pack ( I thought it was three years old but it turns out it was 2 years old in May) still holds 2270 mAh Cheers Danny Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted May 27, 2009 Share Posted May 27, 2009 I had seen them before Richard, Chris pointed them out to me. We were a bit concerned as to why the tabs had been removed? seemed a bit odd. They may well be okay but I am just not sure. Anybody else tried them? Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted May 27, 2009 Share Posted May 27, 2009 In case anybody was interested in the Wot 4 performance this video made a couple of years ago gives a good hint to how well it goes and the duration. Wot4 first flight electric Cheers Danny Quote Link to comment Share on other sites More sharing options...
SA Allan Posted May 28, 2009 Share Posted May 28, 2009 Richard I have seen on RC Groups that the cells from Olympic are second hand , some guys have bought them and they seem ok I have not flown with my A123 pack but cycled it about 10 times at 30 Amps , I stop discharging when the weak cell drops to 2V and put 2100 back . I will work out how much capacity remains in the other 3 cells by discharging with a car bulb while timingt and watching current draw and voltage untill 2 volts per cell. I hope that there is at least another 100mah . Quote Link to comment Share on other sites More sharing options...
260 Flyer Posted June 2, 2009 Share Posted June 2, 2009 One thing is for sure these cells need running in! At up to 5 cycles I was getting an initial peak of 625W which dropped to 580W after a few seconds with the pack voltage (6 cells) dropping to 15.7V. After 25 or so flights on the same setup I now get an initial peak of over 800W dropping to 700W with the voltage hardly dropping below 17V. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted June 2, 2009 Share Posted June 2, 2009 Yes Rob, I have found this also. Quote Link to comment Share on other sites More sharing options...
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