38 of 40 people found the following review helpful
Good performance in low-drain battery endurance test.,
Verified Purchase(What's this?)
This review is from: TWO PROTECTED 3100mAh 18650 (Industrial NCR18650A Panasonic Cell inside) Li-ion Rechargeable Orbtronic Battery Cells- DUAL Protection, Button Top, PCB- High Performance (Tools & Home Improvement)
I recently tested the performance of the Panasonic Industrial 3100 mAh battery to find out how long it would maintain a useful potential difference across its poles during a low-current drain application. The device used for the drain was a Romisen RC-E4 flashlight with an XML T6 LED bulb. (The XML T6 bulb doesn't come standard with this flashlight; it was an upgrade from the original LED.) Throughout the test, the flashlight was switched so that the "low" or "dim" mode of the XML T6 bulb was in use.
As the battery voltage dropped from its initial 4.20V to 3.02V, the light output fell from an initial 48 lumens to about 35 lumens, which is still more than enough to walk around in a dark house or outside on a moonless night. How long did it take this battery, in this flashlight, to make this voltage drop? 72 hours. That's why I like the XML T6 LEDs. Their dim mode is just about perfect.
Test Flashlight: Romisen RC-E4, XML T6 LED.
Low Intensity Setting, 48 lumens.
Battery: Panasonic Industrial 3100 mAh.
10:00 > 3.91V
16:10 > 3.81V
25:40 > 3.65V
30:30 > 3.60V
32:45 > 3.58V
36:00 > 3.56V
41:00 > 3.52V
47:30 > 3.46V
53:15 > 3.38V
57:45 > 3.33V
61:00 > 3.31V
64:09 > 3.29V
67:10 > 3.23V
72:00 > 3.02V
73:15 > 2.97V
75:50 > 2.55V
If you graph the points, you'll see that the Panasonic Industrial 3100 mAh battery begins its voltage versus time downturn at about 68 hours. At 75 hours, the battery is pooped out. I probably shouldn't have kept it going for the final 50 minutes, but the battery recharged OK and didn't seem harmed by its overuse.
Sort: Oldest first | Newest first
Showing 1-1 of 1 posts in this discussion
Initial post: Sep 22, 2012 6:09:58 PM PDT
R. B. Voigt says:
The XML T6 LED doesn't have a "dim mode". The driver circuit is using pulse-width modulation (PWM) to decrease the average power going to the LED, which makes your eyes perceive less light and the battery drain more slowly. But actually the LED is switching between full-brightness and off very quickly. (Switching on and off very rapidly and without wearing components is a significant advantage of solid state electronics, i.e. LEDs, over traditional bulbs)
‹ Previous 1 Next ›