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| Batteroo testing |
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| CJay:
--- Quote from: FrankBuss on December 22, 2016, 12:37:47 pm --- --- Quote from: CJay on December 22, 2016, 12:07:27 pm ---It's a bloody awful result and I'd not expected it to be anywhere near that bad but can we be sure the original cell wasn't faulty* from the packet or was it repeated with other cells? --- End quote --- You are right, I should have measured the voltage. But the speed of the train was as fast as with the other cell, at least in the beginning, and the 4 minute result is not affected, because this was done with the other battery which was used in the first test. --- End quote --- I'm not sure the terminal voltage would have been different if a cell was low capacity, after all a D cell has much higher capacity than an AA but the same terminal voltage from new. I'd just be interested in seeing the test repeated a few times with same brand/type cells to eliminate the possibility of a low capacity cell. I'm almost curious enough to try and lay hands on some sleeves to play with but, damnit, if this carries on Batteroo will make a living selling sleeves to curious engineers :) |
| PA0PBZ:
--- Quote from: FrankBuss on December 22, 2016, 02:17:33 pm ---Time confirmed, 61 minutes this time. --- End quote --- Anyone care to guess why the result is so bad? Simply looking at the efficiency does not explain it. Frank, did you measure the current consumption of the train? Maybe I missed it... |
| dcac:
I’ve seen some tests of AA batteries where the capacity variation in a 10 cell pack could be as much as 70% difference between the best and the worst cell from the same package. But this was the extreme case in the 9 brand test, other brands varied about 3-20%, so still something that really should be taken into consideration. What are the capacity tolerances on a typical battery anyway? are they ever specified. I believe output voltage and internal resistance are monitored at manufacturing, but how about the capacity the battery can deliver when its energy is drawn over hours/days/months or even years. Though I’m not saying this explains the test results we seen so far. |
| FrankBuss:
--- Quote from: PA0PBZ on December 22, 2016, 02:41:57 pm ---Anyone care to guess why the result is so bad? Simply looking at the efficiency does not explain it. Frank, did you measure the current consumption of the train? Maybe I missed it... --- End quote --- Current is about 250 mA at 1.5 V and 210 mA at 1 V. |
| razvanme:
--- Quote from: FrankBuss on December 22, 2016, 03:04:59 pm --- --- Quote from: PA0PBZ on December 22, 2016, 02:41:57 pm ---Anyone care to guess why the result is so bad? Simply looking at the efficiency does not explain it. Frank, did you measure the current consumption of the train? Maybe I missed it... --- End quote --- Current is about 250 mA at 1.5 V and 210 mA at 1 V. --- End quote --- That might explain it, we don't have any data for higher current draw, if it takes 250mA at 1.5V and the batteriser keeps that, it will draw more and more current. We need some data at higher current draw. |
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