WHEN LI-POLYS GO BAD??
08-08-2004 | 05:32 PM
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From: oakton, VA
WHEN LI-POLYS GO BAD??
I am using 3s 2100 thunder power li-polys and am getting flight times of 12 to 20 minutes depending on throttle. Except one pack is now lasting maybe 5 minutes. It charges fine and after power drops off (about 5 minutes) and landing the battery still reads 11.6 volts but not enough power to fly. Is this what happens to polys? Could it be from over drawing the pack? I did bump the gear shaft and didn't notice it was binding one time until I landed and flipped the prop. Thanks for any reply
08-09-2004 | 07:17 AM
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From: Spencerport, NY
RE: WHEN LI-POLYS GO BAD??
12 to 20 minutes means an average of 3-5C, which on the surface is well within the capability of TP2100s. The real issue here is maximum current draw, and how much you used it. IIRC, TP2100 packs have a rating of 6C, or about 12 Amps. If you have a power system that draws more than that, you could be damaging the cells.
Two questions that might clear things up for you:
1. Was the pack that's experiencing poor performance in the plane when the gearbox was binding?
2. What was the second question I was going to ask you? (my train of thought derailed)
The binding gearbox could double the amount of current being drawn by the motor.
Two questions that might clear things up for you:
1. Was the pack that's experiencing poor performance in the plane when the gearbox was binding?
2. What was the second question I was going to ask you? (my train of thought derailed)
The binding gearbox could double the amount of current being drawn by the motor.
