Hello, I just joined, Matt Smith wrote me suggesting I ask this question in this forum.
I'm looking for a round 4 or 8 battery carrier for 21700 protected or unprotected cells. I can use series-parallel or even just series or parallel strings in the holder for my high current project which can use one summed output, or several individual ones, i.e. 4.
I don't care what the carrier costs, within reason. Can someone point me to one? High quality preferred. The carrier shown in this YT video reviewing a huge BLF flashlight is perfect, it can be viewed at minute 2:58. My understanding is that carrier will be able to use 18650 or 21700 cells.
The carrier shown in that video was stated to be a new upgrade, but from what I've been able to find, it is not being offered, not yet anyway. I saw something about it somewhere which caused me to believe there was a 21700 version of it being planned. Sure would love to have either one, 18650 or 21700.
Great, thank you so much, don't know why I couldn't find that on my own. Ordered! I found they offered both sizes, for the 18650 and the 21700, bought both. I am so happy :)
18650 8X battery holder is for the GT94 GT4
21700 8X battery holder is for the GT94X 4XSBT90.2 - I decided to buy the flashlight too :O
Update on the GT94X, received it along with some extra battery holders but the four 21700 batteries are all in series in each holder producing over 16 volts DC for a fully charged set of Li-ion batteries. I cannot have over 12.6 VDC or so voltage for my laser diode drivers I want to use with this flashlight as a host :(
Good news is there is a fix for this, I can put a solid aluminum dummy battery in one of the four cell slots to reduce the voltage to about 12.6 VDC. The bad news is I thought I was getting a holder which had two batteries in parallel and series with the other two to double the capacity at 8.4 VDC which is not what I got. Appears the fix for people putting unequally charged cells in a single holder was to make everything in series and use a driver and LED's which could take the extra voltage. This doesn't fix the issue of someone putting in a second pack which is not equally charged, unless they have a series diode to prevent back charge from the front pack.
I would be better off with a 18650 series-parallel pack except the 18650's don't give me the high continuous current the 21700 batteries can.