[Questions] Everything about Ultrafire 800LM flashlight (specifically "UA100" series)

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dangolvert
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[Questions] Everything about Ultrafire 800LM flashlight (specifically "UA100" series)

 

Hey guys.

I bought this nice 800 LM Ultrafire UA 100 flashlight , you can see the whole specs in the official ultrafire website: http://www.ultrafire.com/index.php/detail/br-level1/40

It is bright enough for me, but I have a few questions on the following technical specifications:

  • Working Voltage: 3.6~4.2V
  • Power Supply: 1 x 18650 / 3 x AAA
  • Current: 3.6~4.2A
  • Brightness: 800 lumens maximum brightness
  • Runtime: 1.5-2 Hour

As you can see, this flashlight comes with an AAA/18650 adapter, so I compared using one fully charged 18650 battery (3.7V, 4Ah) against 3 used alkaline AAA batteries for a short period of time (1 minute or so). I have to say that the difference in brightness was not that significant to my inexpert eye (Maybe the difference is that the AAA batteries were not new).

With a multi-meter I measured the output of a new (same reference as the old ones) AAA alkaline battery and this are the results:

  • 1.5 V
  • 1.75 A.

The "used" ones output is the following (same for the 3 of them +/- 1%):

  • 1.3 V
  • 0.92 A

Now my questions:

  1. how much will it affect the flashlight performance using 3X rechargeable AAA batteries (1.2V, 1Ah) instead of one 18650 (3.7V, 4Ah) battery (in terms of brightness and durability / time of use between charges)? - I am thinking on using brand new GP 1000 mah professional rechargeable AAA batteries as a "back up".
  2. What kind of AAA charger would you recommend for this kind of batteries? (Keep in mind that I will charge 3 batteries at a time - not 2, not 4 but 3)
  3. Just out of curiosity, do you think is it possible to recharge the 3 AAA batteries at the same time placed in the adapter mentioned above with a 18650 charger? (The output of which is 4.2V, 500mA)

I would like to try the 3rd point keeping in mind that the batteries are NI-MH and the chargers is a "li-ion" charger

 

tru3s1lv3r
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Performance wise you won’t notice much difference between the two battery types, specifically because it doesn’t seem to be a direct drive driver. Most, if not all of the li-ion chargers out there will automatically detect a NIMH and adjust accordingly. Just make sure the charger has the ability to charge nimh. I personally prefer my Nitecore D4 charger. It charges up to 4 at a time, automatically detects battery chemistry, and charges pretty quickly for my tastes.

By the way, thats a nice looking G700 you got there!

Aspiring Fhashlightaholic!

dangolvert
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tru3s1lv3r wrote:
Most, if not all of the li-ion chargers out there will automatically detect a NIMH and adjust accordingly. Just make sure the charger has the ability to charge nimh. I personally prefer my Nitecore D4 charger. It charges up to 4 at a time, automatically detects battery chemistry, and charges pretty quickly for my tastes. By the way, thats a nice looking G700 you got there!

Then I guess it won't be possible with my "dumb" charger as this is as simple as you can get one (it is similar to the one in the following image):

About the flashlight I think it is pretty good thanks, but I don't know if the "G700" is a reference for different brands or if it is a brand itself, mine is an "ultra fire UA100" but it certainly looks very similar to the one you mentioned.

The Miller
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Ha I have this as well (remarkable resemblance with the G700 isn’t it ;))
I will try tonight using 3x rechargeable AAA vs 18650 vs 26650. (And now subbed so easy to find)

OK tested and with 3x rechargeable AAA it is a minute little less bright.

tru3s1lv3r
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The G700 comment was an attempt at a joke. The flashlight you posted is the same model as the G700 light, except those lumitac people rebrand it and way overcharge for it. Yea, the charger you have looks like it may not have the capability to charge nimh. To be honest, I never really liked those style chargers anyways. They are cheap, use very low quality components, and have little to no protections. If you are going to get seriously started in these lights and batteries, then a good quality charger is worth its weight in gold!

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dangolvert
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Got it, I am really new to this kind of stuff Big Smile
I bought this flashlight for my night bike rides and the charger came with it.
Now I will look for a good “smart” charger for all kind of batteries.