Tutorial: Rewrapping a battery

Thanks for the heads up. I’ll take some measurements of my cell and find the correct diameter for a 26650.

No problem, I’m sure you’d figure it out sooner or later. :stuck_out_tongue:

Thanks for the great write-up!

It is not exactly the same, the one I uses is without glue.

You have to get something that is slightly above 26 mm in diameter

My experience with pens is that the markings does not last, with these labels it will last.

Thanks for pointing that out.

Do you know how different it will be with the adhesive?

I use an industrial Sharpie for all my cell writing, haven’t had issues with it yet…

I have not tried with adhesive, but I will not expect any different when rewrapping, the final result will probably be a bit stronger.

I have ordered this shrink and it is without adhesive glue whatever…just blue plastic which is a tight fight on a 18650.

pictures in another thread:

I also rewraped a 16340 with the fasttech shrink, this worked but the wrap doesn’t get perfect plain…

Thanks for the confirmation!

Nothing but red x’s…can’t see the pics.

Looks like the server is down, it will probably not take very long before it is up again (I uses a hosting service).

Cannot see pics at the moment.

They are back again.

Nice, thanks!
I have re-wrapped some batteries, did not bother to measure the wrapper before cutting. Just estimated it by eye.

I think after re-wrapping it feels at least as much if not more durable than before.

HKJ gives good advice.

I use a Laundry Marking pen from the Office Supply to mark cells. This is better than the so called “permanent marker”. The Laundry Markers are the ones that never wash out of clothes, even in hot water. Don’t get it too oily before you mark it.

If you mark it….better check your spelling first, you ain’t gonna change it.

Thanks for the tutorial

I have several metres of green shrinkwrap suitable for 18650’s - anyone in the EU who wants some - PM me - the cost will be the postage plus a few pennies. The cells I needed to rewrap have been rewrapped. Happy to supply it in 75mm chunks. And don’t pay till it arrives. Experience there.

Thanks for the tutorial!

Question, isn’t the heat shrink too tight? I know that you need your heat shrink to be 3-5mm wider than what you intend to wrap. If the typical diameter of a 18540 is 18.5mm, how does your 18.5mm shrink wrap fit with a bit of room to spare? I was wondering if I should go a bit bigger by 3-5mm to be safe.

The internal dimeter (unshrunk is 18.78mm). “Circumference” of the flat stuff is 59mm. So 59/pi gives the “diameter”.

it is tight but it works, like i mentioned this shrinks not so much thats why my 16340(16mm diameter) is not so tight shrinked than my 18650.