26800 Lithium-ion battery

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nobody
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Serious question— can’t they just be charged in the light (ft03 for me). Would that work and it would be faster than like the o-light magnetic charger - right?

pennzy
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yes

contactcr
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ArtieT59 wrote:

Ohhh, that’s what you meant with a wooden dowel, great idea! Now Im thinking about it, I have some dummy 14500/AA “cells” (plastic and metal)… maybe I can make a similar setup with those. Going to try that, and if not I have plenty of wood in the workshop! Thanks TomE!


 


Edit: battery check (8 hours in to charge): 4.2v and 4550 mah! It should be done soon, then onto the next one cool

Don’t use dummy cells, they are meant to pass current through them if it’s what I think you have. The dowel is just meant to expand the sliders and keep good pressure on the contacts but the contacts dont connect like a dummy cell.

texas shooter
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nobody wrote:

Serious question— can’t they just be charged in the light (ft03 for me). Would that work and it would be faster than like the o-light magnetic charger – right?

A few reasons for not using the built in charger.
1. Built in charger is not that good. This happens, but on these lights I get a finished battery at 4.19-4.20v. So with these lights not an issue.
2. I’m using it, but have a spare on the charger. With 21700 and bigger I’ve never drained a cell even on a long night of traffic control.
3. Charging ports fail and become water/crap magnets. This one is my sin. I sometimes work in lousy weather and often glue the charging ports closed. I’m so bad that I often toss a new duty style light in the pool for two days. Strip it and look for water. Some of these Astrolux lights fit the duty bill, just not the tactical one.
4. I prefer my favorite charger that I way over payed for but it has the following 20 features. This is me some of the time.

khas
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I made this for my charger :

Not pretty but it works.

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ArtieT59 wrote:

Ohhh, that's what you meant with a wooden dowel, great idea! Now Im thinking about it, I have some dummy 14500/AA "cells" (plastic and metal)... maybe I can make a similar setup with those. Going to try that, and if not I have plenty of wood in the workshop! Thanks TomE!

 

Edit: battery check (8 hours in to charge): 4.2v and 4550 mah! It should be done soon, then onto the next one cool

The highest setting I use on the MC3000 is 2.8 amps so that's what I'm using on these - goes pretty quick smile

Still not the safest setup. I make sure the battery is connected first to the dowel, then the dowel inserted in the charger. The red and black wire magnets tend to always find each other...

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LOL – When I was a kid, most things I ordered came with a little gift of some sort, I liked that tradition and wanted to keep it going.. The candy is something we used to do around Halloween when we could source the candy, but then I found that Costco has them year round. When I restock at Costco they always ask what the heck we do with so much candy. I usually tell them it is my wife.. Evil Other places may give a discount code, or something along those lines, but I prefer an actual gift of some sort. Biggest problem is keeping the employees from eating them all, or they melt in the summer time..

texas shooter
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So while trying to find a similar size cell to find a cell holder. I found this https://en.wikipedia.org/wiki/List_of_battery_sizes and they now list the 26800 cell about 3/4 the way down. “Gaining popularity since 2019, the format for e-bikes and transport. Optimal ratio of discharge currents, life cycle and cost.”

ArtieT59
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Tom E wrote:

ArtieT59 wrote:

Ohhh, that's what you meant with a wooden dowel, great idea! Now Im thinking about it, I have some dummy 14500/AA "cells" (plastic and metal)... maybe I can make a similar setup with those. Going to try that, and if not I have plenty of wood in the workshop! Thanks TomE!

 

Edit: battery check (8 hours in to charge): 4.2v and 4550 mah! It should be done soon, then onto the next one cool

The highest setting I use on the MC3000 is 2.8 amps so that's what I'm using on these - goes pretty quick smile

Still not the safest setup. I make sure the battery is connected first to the dowel, then the dowel inserted in the charger. The red and black wire magnets tend to always find each other...

 

 

yea that would be the problem i suppose innocent I will try soo to make something similar.

 

Nice work to u/Khas too!

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2 × 26800 arrived from a lot of hobbies today. I love this format, its huge! Was going to order 4 but that costs more than ordering 2 times.

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contactcr wrote:
ArtieT59 wrote:

Ohhh, that's what you meant with a wooden dowel, great idea! Now Im thinking about it, I have some dummy 14500/AA "cells" (plastic and metal)... maybe I can make a similar setup with those. Going to try that, and if not I have plenty of wood in the workshop! Thanks TomE!

 

Edit: battery check (8 hours in to charge): 4.2v and 4550 mah! It should be done soon, then onto the next one cool

*Don't* use dummy cells, they are meant to pass current through them if it's what I think you have. The dowel is just meant to expand the sliders and keep good pressure on the contacts but the contacts dont connect like a dummy cell.

 

just saw this, thanks for the heads up. I do have dummy cells, they're 14500/AA, I bought them for that purpose to use in a 9xAA light , so you're right I didn't think of that, they will pass current through them. But would a battery too? Either way, I'll use the dowel to be safe.

 

On another note- 

 

ordered (2) more QB26800 today, and a vtc6, and shopping has gone down! Thanks aloft hobbies for taking a look Into this! I paid $5.90 ship for (3) cells today, even if it takes a little longer that's ok. I appreciate it! 

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max
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I got an extremely melted mess of a Reese's peanut butter cup. I had to throw it away  cry

 

 max

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max wrote:

I got an extremely melted mess of a Reese's peanut butter cup. I had to throw it away  cry

Shipping sweets along with the product is not very common over here but it happens from time to time. Something I always recommend for occasions like this is Haribo's Goldbären. They also sell them in 10g mini packs for gifting. LOL

 

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If you like gummies, see if you can get Black Forest brand. Very good.

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max wrote:

I got an extremely melted mess of a Reese's peanut butter cup. I had to throw it away  cry

I ate mine anyways... frown

texas shooter
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max wrote:

I got an extremely melted mess of a Reese’s peanut butter cup. I had to throw it away  cry

That’s no excuse for throwing away chocolate/peanut goodness. Toss them next time into the freezer.

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max wrote:
I got an extremely melted mess of a Reese’s peanut butter cup. I had to throw it away

Ummm, refrigerator?

 

texas shooter wrote:
That’s no excuse for throwing away chocolate/peanut goodness. Toss them next time into the freezer.

Ach… beat me to it.

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max
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Well, it was mashed flat and flowing outside the wrapper and all over everything. Was quite the mess to clean up. I suppose i could have put the whole box in the fridge but wanted to get the batteries out to check them out. I emailed them and asked them not to waste put chocolate treats in packages in July.

I did get the incentive to run to the store to purchase a whole bag of peanut butter cups... i love 'em. Yes, they are better kept in the fridge  tongue-out

 

 

 max

pennzy
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M&Ms

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pennzy wrote:
M&Ms

 

I agree 100%,  would have been a much better choice for a shipment in July.

 

 max

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mine was a peppermint patty, which you’d think might melt but was fine.

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They melt but harden when chilled. Can’t recall whose it was, but someone left a bag of assorted chocs in my car, or should I say greenhouse, in late summer. Everything was liquid if you tried opening one. Overnight in the fridge, and even though you might have to pick flecks of chocolate from all over the inside paper, they were perfectly edible.

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Finally got some time in the work shop, got this rigged up (theres two batteries charging here, thats why theres a rats next of wires). 

 

Thanks TomE and Khas for the idea on doing this, and thanks to whomever told me not to use a dummy cell!

 

I soldered wire to a 8mm x 2mm neo-magnet (i got a variety pack of 100 neodymium magnets this week, all 2mm thick, from 6mm in dia. up to like 16mm, like $12 but theyll be handy when i need them) and then used a sheetmetal type countersunk washer and torx screw to hold the other end of the wire to the wooden dowel (paint extension pole cut down to about 65mm long). i made one to make sure it works, going to make the other soon. I still cannot find the rest of the 6-pack of aligator clip wires i ordered from amazon a couple months back. so luckily this worked! Soldering to the magnet definitely weakened it, but it still has enough bite to grab the battery with no worries (I could pick the battery up with the connection). i also liked that the countersunk screw holds the wires (charger side) very tightly, less nervousness for me to walk away from the charging setup.

 

 

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Looks good. Does your charger recognize the resistance to be low enough for the full speed charge rate? That’s probably the last step in determining if it was a success. You certainly don’t want your rig adding so much resistance it takes 2 days to charge this mammoth battery.

Another option if you dont want to mess with soldering magnets is a take on what some battery reviewers use for their test rigs:

https://www.amazon.com/dp/B00004SBCO/

You can solder some brass buttons/copper scraps/maybe just bunched up loose stranded wire then clamp it with micro clamp that has no continuity between clamps. I believe the added pressure reduces resistance over just using a magnet to hold. Obviously don’t crush your battery but it’s an option.

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Wow, that’s called being creative.

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contactcr wrote:
Looks good. Does your charger recognize the resistance to be low enough for the full speed charge rate? That's probably the last step in determining if it was a success. You certainly don't want your rig adding so much resistance it takes 2 days to charge this mammoth battery. Another option if you dont want to mess with soldering magnets is a take on what some battery reviewers use for their test rigs: https://www.amazon.com/dp/B00004SBCO/ !{width:50%}https://m.media-amazon.com/images/I/71aaiFPKUtL._AC_SL1500_.jpg! You can solder some brass buttons/copper scraps/maybe just bunched up loose stranded wire then clamp it with micro clamp that has *no continuity* between clamps. I believe the added pressure reduces resistance over just using a magnet to hold. Obviously don't crush your battery but it's an option.

 

Yea, for whatever reason the xtar vc4s charges them only at .5ah. . so it takes about 10 hours to charge them fully unforutnately.. 

 

I have many clamps like that (no metal on clamp pads so no continuity through the bar), but how does the bras button / scrap wire play into it? what do you solder it to? i have a package of brass buttons i bought from MtnE.

 

or are you saying just clamp my wire to each end of the battery terminal then aligator clamp to the charger? i didnt realize the amount of pressure put on the tabs effected the resistence and charge rate. great to know! i could just wrap my battery with an elastic band, around the magnetized ends ? would that effectively do the same thing, and avoid having my woodworking clamps hanging off my desk in my room? lol

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contactcr
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ArtieT59 wrote:

....

i didnt realize the amount of pressure put on the tabs effected the resistence and charge rate. great to know! i could just wrap my battery with an elastic band, around the magnetized ends ? would that effectively do the same thing, and avoid having my woodworking clamps hanging off my desk in my room? lol

 

Clamping pressure has a big effect and why you will sometimes see poor performance using 18650's in 21700 lights or why battery carriers are very sensitive to their fitment and driver spring.  Any weak connection adds to resistance.

 

If you want just press the batteries between your fingers with some force while you re-set your wooden peg spacer.  Hold it tight until the charger does it's auto test and see if it gets the charge rate up.

This may not be your only source of resistance.  The material of your torx screw or it's connection with the battery holder contact points may be weak too but I would start at the battery side and just press it all together by hand to see.  You used a huge dowel so there is plenty of spring pressure there..

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The first one arrived today! it is awesome! 

  

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Check out some of my new lights (picture heavy) and quick first impressions of them here: https://budgetlightforum.com/node/77180

My Sft40 beamshots / comparison thread: https://budgetlightforum.com/node/78100

texas shooter
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ArtieT59 wrote:

The first one arrived today! it is awesome! 


  


Well now it rest on your shoulders to give us the first review. Can you run current test?
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Both orders of mine were delivered today, waiting til I get home.

Home now, 3 tubes arrived, with my 26800 collection. The EA02 and FT02S is compatible. The HK4S came compatible. For the FT03, black and green are ok to me:

3 installed

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