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Questions & Answers
No. Ni-Mh chargers are for 1.2v batteries. (plus other issues) Nitecore makes a couple of intelligent universal chargers for most sizes of Ni-Mh, Ni-Cad, and Li-Ion for under $20. Use 2nd generation 2014 version.
By Daniel H. on October 31, 2017
my dear friend.usually there is no big diffrence. please just check if it is protect lithium battery Or not.
By ledflashlight SELLER on May 4, 2018
It may fit, but the voltage is too high for most aaa flashlights, and might blow your led out.
By Tom Carter on May 4, 2018
Very unlikely as many cordless phones use multiple batteries connected in series (usually 3 x 1.2 volt NiHm = 3.6 volts) and were you to connect these in series it would probably burn out the phone. Perhaps connecting them in parallel would be slightly functional, but it would not be the right thing to do. If you can't… see more Very unlikely as many cordless phones use multiple batteries connected in series (usually 3 x 1.2 volt NiHm = 3.6 volts) and were you to connect these in series it would probably burn out the phone. Perhaps connecting them in parallel would be slightly functional, but it would not be the right thing to do. If you can't find the right pack for your phone, it might be better to buy a pack at the right voltage and power (mAh) and use the connector from your dead battery pack to connect it to your phone. see less
By FloriDaniel on March 10, 2018
As is they will not work as they are too long for peak eigers. I have several peak eigers and the heads won't screw to the body with this cell. A fenix ld01 works very well. So will an olight i3s if you rip the spring out and trim it down a bit.
By Michael Flores on March 10, 2018
Due to the protection, the thickest spot on the battery is 10.6mm. I needed to remove the label, the protection circuit, and line to positive, to fit it in a DQG Tiny AAA Ti, then it's only 10.06mm diameter.
By Keith on December 8, 2017
Can't attest to thier operation in those temps, but one thing you may want to consider before buying these (that I overlooked) is that the protective circuitry means extra material. Unless you have a lot (and I mean a lot) of play, these won't fit in a standard 10440 or AAA battery pack. I'd recommend the unprotecte… see more Can't attest to thier operation in those temps, but one thing you may want to consider before buying these (that I overlooked) is that the protective circuitry means extra material. Unless you have a lot (and I mean a lot) of play, these won't fit in a standard 10440 or AAA battery pack. I'd recommend the unprotected ones because they fit. see less
By Chris on November 11, 2017
The battery that come with the Ultratac K 18 is a 1.5 v i order some 3.7V Li-ion 10440 because they are brighter and rechargeable.
By Amazon Customer on October 31, 2017
I don't know if any remote control uses 3.7 volt battery or not, but I will not try this 3.7 volt battery on any remote control using AAA (1.2 or 1.5 volt) battery. It might just damage the device. This is 10440 Li-ion battery and it just has the "size" of AAA battery.
By Kevin on June 17, 2017
sorry i donot understand clearly,there is Pcb board on itdonot worry
By ledflashlight SELLER on June 6, 2017
based on 210 Customer Reviews
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July 21, 2017
In a world where protection is backwards, these are great to use on small EDC keychain flashlights that lack battery protection. The battery will basically just shut off when it gets down to 3v, and after some amount of seconds, then shuts the protection off until there's another power draw. So these batteries do their job. And the protection, at first, can easily confuse someone that they have a completely dead failed battery. As these seem to be the *only* choice for 10440s on, they work alright for me at a great price. These batteries claim 600mAh capacity, however I tested them to only have about 325mAh at most. Which is about accurate and expected as the typical capacity of 10440s is 340mAh. And never expect the best or typical from any *fire* brand.
July 12, 2017
Purchased (4) 10440 cells to use in a headlamp that uses 3 AAA cells. The headlamp is a cheap model that is presumably resistor based. When I measured my half used AAA batteries, they were at about 1.32V Open circuit (3.96V total), and it sagged down to about 3.4V under load. I charged up the cells to 4.2V and discharged them at .2A down to 3V and they measured from 310mAh to 321mAh. I rewired the battery holder to run the cells in parallel, and under load, the voltage sags much less. Run time will likely be decreased, but the headlamp will be brighter and lighter. Run time should be more than necessary. One note, the protected 10440 cells are longer than normal AAA batteries, so they won't fit in most applications. I cut off the protection PCB at the bottom terminal. You'll need to be diligent about charging and checking for over discharge.
By Aaron B.
July 4, 2017
These are a protected cell and as a result, are approximately 2mm longer than a regular AAA cell. I measured a standard AAA cell at 44mm and this battery at 46mm. The advertised capacity is nowhere near 600mAh; all 4 of the ones I got topped out at slightly over 300mAh when tested for capacity. You cannot use multiple Li-Ion cells like these on series like you can alkalines, so they are really only useful in single battery application, such as a keychain flashlight, which was my intended use. Unfortunately, that extra 2mm prevents the contacts on the head of the light from making contact with the bottom half, so this will not work in a screw-type switched light. It may work in a light with a tail cap switch, however. As long as you understand the capacity is half what is advertised, these are still pretty good value for money, especially if you need a protected cell.
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