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Pete's Planes |
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Cell Test Puffin 3300 |
| An 8-cell pack was tested. New, and broken-in. Data was obtained from six discharges, which ranged from 50 amps x 3 minutes, to 5 amps x 30 minutes, approximately. A variable resistor was used as the load, reset for each run. Setting remained unchanged during each run. A temperature limit of 160F was applied. On some runs this temperature was reached before the discharge was complete. In these cases the discharge was paused, and resumed when the cells had cooled. Verdict; Good. Slightly better cells can be had at a much-higher price.
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Discharge Test down to 0.8V per cell |
Puffin 3300 NMH sub C [22mm dia x 44mm] 62grams |
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Nominals |
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Discharge duration |
minutes |
2.8 | 4 | 5.6 | 8 | 11.2 | 16 | ||
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Time to reach 160F |
minutes |
2.5 | 3.3 | 4.5 | 7 | ||||
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Average EMF |
volts |
0.9 | .94 | .98 | 1.01 | 1.04 | 1.08 |
1.2 |
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Average current |
Amps |
46 | 40 | 33 | 25 | 18 | 13 | ||
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Average power |
watts |
42 | 38 | 33 | 25 | 19 | 14 | ||
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Average power/weight |
W/gram |
.68 | .61 | .53 | .40 | .29 | .21 | ||
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W/lb |
308 | 278 | 242 | 183 | 132 | 95 | |||
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Capacity |
Amp minutes |
129 | 160 | 185 | 200 | 204 | 208 | 198 | |
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mAh |
2150 | 2667 | 3083 | 3333 | 3400 | 3467 | 3300 | ||
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% of nom'l |
65 | 81 | 93 | 101 | 103 | 105 | 100 | ||
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Energy |
watt minutes |
118 | 150 | 181 | 202 | 210 | 225 | 238 | |
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% of nom'l |
50 | 63 | 76 | 85 | 88 | 95 | 100 | ||
Average: Values are higher at start of run, lower at end.
Times are in decimal minutes [not minutes and seconds]
Values are per cell, where applicable.
In practical use, these cells have performed in-line with the test results.