Can this be used to charge 2x 3.7v 18650 batteries that are inside the same flashlight?
1409347
I believe these are made to charge 1 cell at a time, which is best for Lithium batteries.
1773480
The BMS (battery monitor system) is inside the charger, independent for each battery, so it works acceptable.During discharge there is no BMS, so they're relying on the application to handle that. I use these in LEDFlashlights, which the majority have undervoltage shutdown, although it's based on the string of batteries, so if you have two in series and one is fully charged and the other is discharged, you could have problems.If you fully charge the two batteries and put them in the flashlight at the same time, you shouldn't have any problems.
605529
Yes, you can use the 3.7v. I use a rechargeable 3.7v, and it actually produces a brighter light than a standard AA lithium.
732430
I am not sure. I have the BRC 18650 3000 mAh 3.7 li-ion 2 battery recharge pack. And that works great. The light itself for the cost I feel I made an excellent choice
1199495
I don't think so. I tried to charge 2 12 volt batteries together for your same reason but that didn't work.
1352169
No. You would need 3 in series to get the right voltage, and that won't fit. But if you have an old "dead" laptop battery, try opening it up; they are usually full of ~6 of these 18650s, and usually it's only 1 that's gone bad. You will need a charger, though, and a good one. Tenergy makes a good one, that charges up to two cells independently (that's important for lithium batteries!!); it's ~$40 and comes with 2 high-quality 18650 batteries, so you don't really need to mess with the old laptop after all.
1945396
They will not damage your flashlight. I use the exact batteries in my New Intova Nova LED Scuba Diving Light. They will charge quickly and I can get two dives per charge or several surface dives looking into holes and caves. The charger seems to work fairly well too. I have been using the charger and batteries for around six months here in Hawaii.
1474943
Yes, although I would parallel no more than three. Also, if the batteries are of differing ages, it's not a good idea, as they will respond differently to both charging and pulsing, and a defective battery may load a good one. In general, batteries charging in parallel should be isolated from one another by a diode in series with each battery. This will reduce the charging voltage slightly, and thus will extend the recharging time.
2260477
I don't know, sorry I cannot answer that, however I am sure it is safe to charge 2 batteries.
940331
Certainly. I use mine to charge 4, 6-volt golf cart batteries that are run in series.
7335
Jared, I use the 3-Volt 18650 batteries in just about every flashlight and Laser I own. Never had a problem with them. Just make sure you use the right charger designed for them, to re-charge!
1964571
The charger is designed to charge both aa and aaa batteries, in multiples of two. I don't know for sure if you can comingle aa and aaa batteries for charging at the same time.
2122791
It will charge any AA or AAA rechargeable battery. I don't know what 18650 batteries are
1517657
I've always used them with two cell flashlights. If the six batteries are in series (- of one battery against the + of the next battery and so on), then you'll increase the voltage but the overall power capacity remains the same. For example, two 1.5 volt batteries in series gives you three volts, but overall should have the same overall power capacity as one 1.5 volt battery. Six would be 6 x 1.5 = 9 volts. Now Having said that, I have recycled nearly dead batteries into flashlights with these LEDs and still get very useful amounts of light for several more months (where the conventional flashlight bulb would have become too dim to use). Hope that helps, Joe
554132
One of these does work to replace two CR123 batteries IF the device is designed to handle either. For instance I have two Fenix flashlights that both use 2 x CR123 batteries. One is an older model and a 18650 does not fit. One is newer and was designed to work with two CR123 or a single 18650. If your device does not state it can use either type its a tossup - as previous posters noted the diameter and voltage and terminal shapes are different.
2122788
This would be a question for the manufactorer. (Sorry) If you ask me, I would think no only as the 18640 batteries are 3.6v and this appears to be designed for 1.5v AA or AAA batteries. I do see there is a whole line of 18650 charges so I would also say no. You can find an 18650 charger cheap on here. AC Wall Charger for 18650 Rechargeable Batteries Hope this helps.
1640583
Kelly, the charger works with 18650 batteries only, so, also you can measure the length and the thickness of yours batteries then if you have some 18650 to compare the size, then you will be ok.