short protected 18650 needed

turbodog · Feb 20, 2021

Had some 'aw' protected 18650 cells from hds. They are all gone, and I am looking for a replacement.

Need to be protected and short/thin as possible.

Bought a batch of panasonic but the button top and triple shrink wrap make them too large to fit.

adamlau · Feb 20, 2021

Good luck. One option is to roll your own with purchased PCBs and copper conductive tape. Another is to have them custom made by AA Portable Power Corp, or possibly vendors such as IMRBatteries/Liion Wholesale/et al. There is always LiFePO4 and frequent changeouts

Mister S · Feb 20, 2021

Would a protected 16650 work?

turbodog · Feb 20, 2021

Mister S said:
Would a protected 16650 work?

That would help diameter, but the length is still a problem.

adamlau · Feb 20, 2021

18650. 18mm in diameter. 65mm in length. 0 round. A PCB adds at least 1.5mm in length. Either leave the adhesive conductive tape exposed at the positive (not recommened), or cap it with a thin layer of conductive epoxy or a small magnet. That is the best you can hope for.

turbodog · Feb 20, 2021

The old 'aw' cells from hds were just right. shorter than other protected cells. shrink wrap that was thin.

alpg88 · Feb 20, 2021

tenergy used to make flat top protected 2600, the top was sticking enough to have a contact in series, i used them for solarforce l900. those were the shortest protected 18650 i've seen, that was 7 or so year sago, eagletac were short too, according to some posters here, but i never used them personally. this question pops up every couple of years, use search, you may find other options,

lightfooted · Feb 23, 2021

My Keeppower protected 16650 cells measure 68mm at the button.

turbodog · Feb 23, 2021

lightfooted said:
My Keeppower protected 16650 cells measure 68mm at the button.

Turns out it's a lost cause. My modern HDS lights with 18650 tube will accept protected cells. My older one will not, regardless of how short.

turbodog · Feb 23, 2021

turbodog said:
The old 'aw' cells from hds were just right. shorter than other protected cells. shrink wrap that was thin.

And I was wrong on these cells. They are pretty short, but not short enough for the out-of-spec 18650 twisty tube.

adamlau · Feb 23, 2021

HDS should have a 2.0v cut off. A protected cell isn't necessary.

turbodog · Feb 23, 2021

If you are always able to start with a fresh cell. And given the problems with parasitic drain and HDS... I don't trust the light's protection.

short protected 18650 needed

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