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Post by Solitaire on May 23, 2009 20:59:52 GMT -6
Who knows with these things. I've got two 900 mAh LiPos for my Lama4 that always get back 800+ even though they get a recharge at the 3.6v/cell point. Could just be a case of the LiPo being underrated.  Slaving...Pfffft |
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BTCat
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Post by BTCat on May 25, 2009 20:27:40 GMT -6
Final Report. These temps are rather consistent. The Hyperion battery does stay a few degrees cooler, but none of them seem to be getting hot. As I said before, we need a stick jammer to put these through the paces.
Zippy 2 107/101/98; Flight Time 12 minutes; Final voltage 11.09
Hyperion 103/101/98; Flight Time 13 minutes; Final voltage 10.98
Zippy 1 106/102/99 Flight Time About 11.5 minutes; Final voltage 11.16
Now for charge times with my 5 amp charger. I charged all three batteries in Balance mode this time and I documented the time to full. If I pulled the Hyperion off the charger at 12.58 when it drops amperage, I think the charge time would be about 15 minutes less. Notice the final mah on the Hyperion:
Hyperion: Top Rate - 4.4a; Time to Balance – 50:16 min; Total mah – 2323
Zippy 1: Top Rate - 2.2a; Time to Balance – 66:44 min; Total mah – 1926
Zippy 2: Top Rate - 2.2a; Time to Balance – 70:41 min; Total mah – 2087
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Post by Solitaire on May 25, 2009 21:43:16 GMT -6
Thanks for the details, BT. Appreciate the extra effort. Looks like the Hyperion could be closer to a 2500 or 2600mAh LiPo, which is a bonus.  |
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akent
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Post by akent on May 28, 2009 21:38:51 GMT -6
You flew for a long time, BT!
Then you put 2180 back in to a 2200 battery. I have been unable to find out how that affects anything.
I have put back in far more than the rating of the battery, several times.
Example is 2200, 30C 3S. Put back 2500+. Must have been REALLY dead. I sadly don't remember the voltages at either end. But this battery is still working fine!!
I am either really dumb, or this is really new science.
Kent
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Post by Solitaire on May 28, 2009 22:03:15 GMT -6
It has to be one of two things, Kent.
Either the LiPo is underrated or the charger is not accurate in replenishing the mAh.
Could be a bit of both, actually.
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BTCat
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Post by BTCat on May 29, 2009 5:05:00 GMT -6
It has to be one of two things, Kent. Either the LiPo is underrated or the charger is not accurate in replenishing the mAh. Could be a bit of both, actually. If I were a little more ambitious, I would hook my Fluke up inline with the charger and measure actual Amp output with displayed. I think a few samplings of that would tell a story. I'm betting the charger isn't that accurate and that it uses a simple calculation to come up with the mah total. I think I'll try that this weekend. Should be easy enough. |
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BTCat
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Post by BTCat on May 30, 2009 10:40:50 GMT -6
Okay, so I put my Fluke in-line with the charger and monitored actual amperage in. The T6 exaggerates amperage by about 5%. So, I am actually putting in 4.2 amps when the T6 displays 4.4. I am putting in 2.1 @ displayed rate of 2.2. Not much, but considering the T6 uses this and a little simple math to calculate the total mah of the charge, it throws all amp and mah figures off by 5%.
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