TFSeven TR10440 600mAh 3.7V Rechargeable Lithium Batteries, Blue, 4 Pieces

BUYER BEWARE------THESE ARE ONLY 300mAh CAPACITY AND NOT 600 mAH----One star due to the very low battery capacity of 300mAh and advertised capacity of 600mAh and not being a protected battery though I suppose that the Chinese sellers selling these Chinese made batteries that the sales technique is to say the battery is protected or to not say anything if it is not a protected battery so you don't think about this important feature when buying this battery. If they said it was not protected then you may buy elsewhere and that just is not acceptable.NOTE: Both the Streamlight and Pelican (as well as the other Little Itty Bitty's) are constantly being tweaked with a more powerful and efficient LED light. My comment refer to a Streamlight bought in 2014 and a Pelican just recently purchased (72/14 lumen rating with a 1.5V).I bought this for my Streamlight microstream specifically but also have other small flashlights that are not my EDC that I was going to use these in..Initially I was impressed with this battery in my microstream flashlight as I believe I was pushing 120-140 lumens with this battery. It would draw 930ma which translates to 3.5 Watts and at the theoretical maximum 100 lumens per watt would translate to 350 lumens. I was not getting 350 lumens (what my Streamlight Stinger puts out) but those that have used a Lithium battery in this flashlight know that it really sings but also gets really really hot thus there appears to be allot of power conversion loss with allot of the batteries energy going to heat instead of light. The 120-150 lumens is estimated by eye compared to my other rated flashlights. None the less a 3.8V battery in the microstream is impressive indeed especially since the microstream beam is more focused and thus has more throw and it is such a tiny and very cute flashlight. If only it came in pink, could be accessorized, and showed off some skin....with a bit of T&A...... as I am sure the girls would love it then...and the boys would buy it for them......by the way for the extra umph Lithium battery I think the Pelican or the lumapower EDC are a more appropriate match as they don't get so hot (so no massive loss of battery energy in the form of heat) and those flashlights have a second or even third lower power setting to make the battery last longer than a 1/2-3/4 hour that it does on the high setting. BUT FOR SHEER THROW OF LIGHT AT A DISTANCE THE MICROSTREAM DOES KICK BUT OVER ALL OF ALL MY OTHER LITTLE ITTY BITTY's-but only for 10 minutes as after that those other flashlights keep going while the microstream goes blacklight. I am thinking of switching to the Lumapower EDC as my EDC. The Olight is nice but I like the pocket clip. My choice would be the Pelican if the clip was not like in the center of the flashlight which makes it sit to high for my shirt pocket flap to be buttoned where as my microstream has the clip at the very end so it sits nicely in my shirt pocket with my pen For sheer form factor I really like the microstream. If the microstream had a second lower power (~6 hour) setting for a Lithium battery (likely to be <10 lumens)-then even with the heat and inefficiency issue at high power-then that would be my Uber EDC flashlight.My Pelican tested this battery more appropriately as it does not get real hot so no lost energy to heat and it draws less amps. It draws 480-510 mA and I believe puts out ~110-120 lumens on high (by comparison with advertised rated flashlight lumens) and compared to the 1.8 Watt power consumption and maximum theoretical capacity at that power of 180 lumens. I am able to get 35-40 minutes of use on the high setting which matches the XTAR battery charger results of 300-340mAh battery capacity. As stated the much lower runtime of the Streamlight has more to do with the heat generation (it gets smoking hot) than the extra 30 lumens it produces. The pelican is ~68% efficient (120/180 lumens) while the streamlight is 40% comparison relative light generation efficiency (140/350 lumens) with the difference going to heat. So if you are in snow country during midwinter the microstream makes a better hand warmer (for 10 minutes) than all the other Littly Itty Bitty's.-----------------------------ENOUGH SAID ABOUT THE FLASHLIGHTS NOW ONTO MY COMPLAINT ABOUT THESE BATTERIES!BUYER BEWARE------THESE ARE ONLY 300mAh CAPACITY AND NOT 600 mAH-----------------------------THE BATTERIESI am averaging only 10-12 minutes of lighting per charge. One battery only does 6-7 minutes. This translates to only 180mAh by current draw X time (thus it does includes the heat energy from the battery). From my understanding and limited experience the Lithium batteries are not suppose to have the battery capacity affected as much by high current draw-i.e. battery manufactures list battery capacity at low current draw to make their battery seem impressive but at high current load the effective capacity drops off. These batteries besides having low capacity from advertised are hugely impacted by currents over 500mA reducing effective capacity even more.I used my Pelican at the low setting to drain these batteries then recharged them on my XTAR charger (nice charger by the way-only wish they could also add the USB battery pack feature with a micro USB jack to make it the UBER charger). The XTAR consistently showed these batteries in the 310-340mah range. This compared exactly with the battery rating of my Pelican at ~480-510mA on the high setting getting 35-40 minutes of on time. Strange thing is that the battery that lasts the least in my microstream at 6 minutes has the highest capacity of 340mAh by this technique. The mysteries in life never end!Thus my main complaint. As TWO OTHERS PREVIOUSLY POSTED is that these batteries have the usual Chinese corrupt practice of Mislabeling to mislead you into buying these batteries as they are only 300mah capacity more or less. The overstating is not as bad as some Chinese products as they only doubled the actual rating for the advertised rating but none the less has the usual Chinese unethical and immoral lying of their products ability to deceive the Western Buyer into buying their product instead of a honestly advertised Western Made Product. I have not had these batteries very long so I can not speak for durability or longevity but if the deceitful capacity rating is indicative of how honestly they advertise there battery then I expect these to be easily damaged from normal use (1 Amp charge and Discharge being too high for these batteries) and a very short life (100 charges) BUT I DO NOT KNOW THESE LATTER TWO RATINGS TO BE A FACT FROM MY ACTUAL USE. So if Surefire says the battery is 8" long I would tell her that it is really only 4" long because they like to overstate things that buyers find important so if that is long enough and the price is right for the actual length then go for it! ==========================================================================BUYER BEWARE------THESE ARE ONLY 300mAh CAPACITY AND NOT 600 mAH----THERE ARE OTHER REVIEWS THAT ALSO STATE THIS -though truthfully by my testing be rated at 325mAh when new--If you think the price is fair for a 300 mAh battery then keep in mind that my review does not include longevity which is also likely over advertised. Figure this into with the price to find the actual value. If the price is acceptable for a 300mAh battery then go for it!BUYER BEWARE------THESE ARE ONLY 300mAh CAPACITY AND NOT 600 mAH----

OMG! Don't look straight into the light!I put these in one of the new mini-flashlights that use a CREE LED "bulb" and an AAA battery and watch the lumens jump! My light supposedly put out about 60 lumens before. I'm guessing closer to 200 now!Admittedly, that isn't saying much about these particular batteries. They seem to work. And so far, the result, possibly with nothing to do with this particular company or these particular batteries, is AWESOME!If anything causes me to reevaluate these particular batteries - whether through experience with other 10440's or just through unusually short life, etc. I'll update my review.UPDATE: I'm pretty sure my flashlight is going to explode. Again, nothing to do with these particular batteries, but I'm fairly certain that my flashlight that is meant to run off of 1 AAA battery will burst into flames if I run it for more than about 3 minutes. It gets REALLY hot. After about 3 minutes, it will possibly burn flesh. I may eventually try an experiment and run it until it explodes or runs out of charge. But, for now, buyer beware!

I bought this for my flash light LED LENSER M3R. looks very nice but this didn't have circuit protector so total length is shorter than LED LENSER's one. need tighten the end cap perfectly because sometimes doesn't turn on due to the battery length.

Really good batteries. Seems to hold the charge. I use these batteries in a microstream flashlight and what a huge difference in the light output when compared to regular AAA alkaline battery. I would guess that by using 10440 rechargeable battery, the streamlight increases from around 20 lumens to 60 lumens. The light is at least 3 times brighter when I use the 10440 batteries.

Seem like good quality and charged without a problem. Pricing seemed in line. I would gladly purchase again. I had no way of checking the actual capacity verses the advertised rating.

Product received defective for all the multiple packages I ordered, my lithium ion charger would not even detect the battery to attempt charge. Really surprised as company has high rating. Will not attempt to order from company again, batteries are being sent back.

These batteries are working great! Use them in my streamlight microstream. The difference in brightness over the Alkaline batteries is quite a bit. Have two charged up, use one at a time so I can swap when needed. Would defiantly purchase again when I need more batteries.

I have not done any scientific test but I feel as though they do not have the rated capacity . They ran the excact same time in the same flashlight as battery's rated at 350mAh.