Will Convoy S2+ Fit 18650 Cells with Buil-In USB Port?

[ilikelights]

@zoulas

The issue is not the USB port, its that they are likely protected. The protections circuit is what makes them longer. My S2+ wont take protected batteries. They stick out of the body about a 3/8 inch. So I use unprotected with are considered better (by many BLFers.)

I think what’s making this topic confusing is that there is no standard of dimensions between manufacturers for these cells. They all seem to differ, and seem to take a different approach. Nitecore makes one with a significantly less capacity, maybe they reduced the battery capacity so the cell occupies the same space as a standard 18650. Whereas we can clearly see from HKJs thread that other manufacturers just added the circuit on top of a pre-existing 18650.

HKJ did a dissassembly review of these of these “USB cells”, I believe the protection circuit and charge componenets on these cells are on the same PCB that holds the micro USB port, so I’m not sure that is correct? I’m positive the Micro USB port does add some height overall. Maybe that’s the 2mm Lumintop quoted, 2mm over their protected cell. Which makes sense. Will try to dig out that post.

See here:

Disassembly of USB charged batteries

Disassembly of USB charged batteries [image] I have reviewed these two batteries and wanted to see how the electronic was made. I expected them to be about the same inside, except Lumitop must have two charge chips (There is a jump on the usb charge curve) and MecArmy must have one. [image] The usb charge circuit and protection is placed at the top of the battery. Lumimtop [image] [image] First step is to get rid of the wrapper. [image] The…

Also, yes I understand why most BLFers prefer unprotected cells, and agree for the most part they are better. But for this application, I need the light to be “travel” friendly where I don’t have to carry extra equipment (ie: charger). I will already have a Micro USB cable and USB power supply with me wherever I go for charging phones and other devices that will be with me.

Thanks for the pictures spoonrobot. Provided these cells are still popular and not all discontinued, I’m sure I can make it work.

I know Nitecore still makes them. Have to look more into what supply is still out there, and if this is a long term solution or perhaps these cells are going the way of the dodo…