i recieved 3 batteries last week on 25/8/2009, one is very good and balances well, the other two batteries had one cell each that read below 2.5 v. these cells don't charge over 3.9 v causing the overall voltage to drop very fast, the readings of one battery when i recieved is:
Cell 1 had a voltage of 3.85v charged up to 4.20 v Cell 2 had a voltage of 3.86v charged up to 4.18 v Cell 3 had a voltage of 1.9 v charged up to 3.9 v
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25 thumbs up!
Good value for the price but only 3 stars because I suspect performance is a little overrated. Great when fresh but noticeable loss of punch midway thru flight. Now beginning to swell (just a little) after about 15 cycles. Also heavy and bulky for the capacity.
Used on Precision Aerobatics Katana MD and Addiction with appropriate IPAs and props. Never been discharged under 11.5v. Max draw on either plane 40A, well within spec for the battery.
Ordered 2 packs.. One had a bad cell on arrival.. The 2nd fly well in yhe Easy Star but requires balance charging after each flight as one cell drains a bit faster then the rest. .1v lower when discharged.
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18 thumbs up!
I checked the capacity with a constant load of 20A and the result was exciting: 2220 mA and the drift of the cells was quite low. Also lipomon from rctool.de fits well to the balancer connector.