Customer Review

38 of 40 people found the following review helpful
5.0 out of 5 stars Good performance in low-drain battery endurance test., April 18, 2012
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.
Initial 4.20V
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.
Help other customers find the most helpful reviews 
Was this review helpful to you? Yes No

[Add comment]
Post a comment
To insert a product link use the format: [[ASIN:ASIN product-title]] (What's this?)
Amazon will display this name with all your submissions, including reviews and discussion posts. (Learn more)
Name:
Badge:
This badge will be assigned to you and will appear along with your name.
There was an error. Please try again.
Please see the full guidelines here.

Official Comment

As a representative of this product you can post one Official Comment on this review. It will appear immediately below the review wherever it is displayed.   Learn more
The following name and badge will be shown with this comment:
 (edit name)
After clicking the Post button you will be asked to create your public name, which will be shown with all your contributions.

Is this your product?

If you are the author, artist, manufacturer or an official representative of this product, you can post an Official Comment on this review. It will appear immediately below the review wherever it is displayed.  Learn more
Otherwise, you can still post a regular comment on this review.

Is this your product?

If you are the author, artist, manufacturer or an official representative of this product, you can post an Official Comment on this review. It will appear immediately below the review wherever it is displayed.   Learn more
 
System timed out

We were unable to verify whether you represent the product. Please try again later, or retry now. Otherwise you can post a regular comment.

Since you previously posted an Official Comment, this comment will appear in the comment section below. You also have the option to edit your Official Comment.   Learn more
The maximum number of Official Comments have been posted. This comment will appear in the comment section below.   Learn more
Prompts for sign-in
 

Comments


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 ›