20700 Batteries What is real?

[RobertB]

@DB Custom

Tom, you could send those 2 A’s over here and let me see what 3 50.2’s think of em… HKJ’s site shows they hold up better than virtually anything at a 30A drain, can’t find a 26650 cell that will best em. Can’t find 2 for myself anywhere either, at the moment.

Mooch rates the new iJoy 26650 at 30A continuous. Liionwholesale has them instock

[DB_Custom (Dale)]

Will try those, thanks Robert.

[SubLGT]

A new option in 20700 cell size, from iJoy:

iJoy 40A 3000mAh 20700 Bench Test Results...overrated but a good 30A battery

This is an overrated 20700 cell (20mm diameter x 70mm length) that performs well but not quite as well as the Sanyo NCR20700A. Its appearance is similar to the Panasonic/Tesla cell, with its 5-leg top contact, but I cannot confirm that this is indeed the Panasonic cell. There are differences in the top crimp seal and tooling marks……I am rating this iJoy at 30A and 3000mAh.

[DB_Custom (Dale)]

I got a pair of Sanyo NCR20700A from TomE to test in a couple of lights. The most impressive for me was in a Convoy C8 with a copper pill from ryansoh and XP-L W2 2B emitter. It only dropped like 238 lumens over a 2 minute test in the light box, pretty sweet!

6.63A at the tail on turbo, with lumens numbers like this…

At start, 1728.45
at 30s, 1566.30
at 60s, 1538.70
at 90s, 1511.10
at 120s, 1490.40

The above test was with the Sanyo A cell fresh off the XTAR Rocket charger at 4.22V, ended at 4.10V.

In my triple 50.2 light the 20700A gave 24.40A for 11,833.5 lumens, an increase over the 5000mAh LiitoKala 26650 (23.12A 11,488.5) The drop when running was very comparable to the larger cell, showing 9211.5 at 60 seconds as compared to the big blue at 9,004.5 at 60. Remarkable to me that a ~3200mAh cell can hold it’s own against a top ranked 5000mAh cell! Not to mention the size differential between 20700 and 26650. Impressive results, now to get my hands on some of these A series Sanyo’s!

Thanks Tom! Really appreciate your help on this!

[Tom_E]

It's all good. Glad to see those results! Nice!

True, if we could get them somewhere, somehow, and be able to use them. Weird, only IMRBatteries seemed to have them, and that was only for a short time, guess limited stock.

[EasyB]

@DB Custom

Ok, y’all remember the old screw in pill style C8 that I put an XP-L W2 2B in and it made over 2000 lumens? Tonight I bored the tube for the Sanyo 20700 cell. Fits! Now I get to see what this new W2 2B can REALLY do!

Edit: I got the higher capacity “B” cell, it does 6.01A for 1704 lumens. My original readings with a top 18650 were 6.67A for 2032 lumens as I recall, so this B cell is up there but not surpassing the top 18650.

Any more comments or updates about your 20700 bored C8 tube? IMO this is the best way to utilize the increased performance capabilities of these 20700 cells. I assume you used a boring bar tool on the lathe? Any difficulties with the tube being too thin or anything?

I’m thinking about making a quad dedomed XPG2 C8 light and using a 20700 cell. Four ~17mm TIRs (like used in a S2+) should just fit in the C8. This setup should make about 3000 lumens and 90 Kcd in a nice compact light.

[teacher]

@DB Custom

Ok, y’all remember the old screw in pill style C8 that I put an XP-L W2 2B in and it made over 2000 lumens? Tonight I bored the tube for the Sanyo 20700 cell. Fits!

I obviously missed this when you posted it Dale, wow. :+1:

What kind of wall thickness did that leave the tube having??

[EasyB]

I did some measurements on the latest C8 tube. ID is 18.62mm. Smallest OD at the threads is 21.49mm. The 20700 cells are 20.2mm wide, so with a bored ID of 20.5mm that leaves about 0.5mm wall thickness at the minimum. It would be thicker for most of the tube. I’m not sure if this thinness is getting into dangerous territory or not.

[teacher]

---

Thanks EasyB…… :+1:

[DB_Custom (Dale)]

I kept it as thick as possible, the 20700 cell pushes in, not tight enough to keep it from coming out but it doesn’t slide in and it sure doesn’t rattle! lol

Yeah, it’s probably too thin, where they cut the flats for the branding. Otherwise I think it would probably be all right. I’m wondering if we could convince J-Dub to convince Simon to bore a run of C8’s to fit the 20700?

[DB_Custom (Dale)]

I asked J-Dub.

[teacher]

@DB Custom

I kept it as thick as possible, the 20700 cell pushes in, not tight enough to keep it from coming out but it doesn’t slide in and it sure doesn’t rattle! lol

Yeah, it’s probably too thin, where they cut the flats for the branding. Otherwise I think it would probably be all right. I’m wondering if we could convince J-Dub to convince Simon to bore a run of C8’s to fit the 20700?

@DB Custom

I asked J-Dub.

OK, thanks for the info Dale. :+1: … Thanks for asking J-Dub too.

[Rufusbduck]

Anyone have numbers on the newer C8’s? Also the M1 might have a thicker tube. The narrowest point of OD will be at the O-ring lands.

[EasyB]

@Rufusbduck

Anyone have numbers on the newer C8’s? Also the M1 might have a thicker tube. The narrowest point of OD will be at the O-ring lands.

@EasyB

I did some measurements on the latest C8 tube. ID is 18.62mm. Smallest OD at the threads is 21.49mm. The 20700 cells are 20.2mm wide, so with a bored ID of 20.5mm that leaves about 0.5mm wall thickness at the minimum. It would be thicker for most of the tube. I’m not sure if this thinness is getting into dangerous territory or not.

This is latest C8 I think, with integrated shelf. The OD at the flat with the brand label is 23.01mm. The o-ring spot is 20.98mm OD.

[Rufusbduck]

Thanks, that means these are still an viable option for wood sleeved tubes that require a .5 mm brass liner for circuit continuity. Anyone have the numbers on the fixed shelf M1?

[Tom_E]

IMR Batteries just emailed say'n they got an iJoy 20700 3000 mAh cell. Guess they added an iJoy label to the SANYO 20700A and added $2.

https://www.imrbatteries.com/ijoy-20700-3000mah-30a-flat-top-battery/

It's a good cell for sure though.

[DB_Custom (Dale)]

And here I sit, broker’n a broke d* dog.

Thanks for the heads up on these Tom, maybe they’ll still have some next week…

[cncyana]

@DB Custom

I’m wondering if we could convince J-Dub to convince Simon to bore a run of C8’s to fit the 20700?

On the bore size, maybe asking J-Dub for a 21mm bore now would be better since several types of 21700 batteries are sure to come down the road in the near future and rather than get 20mm bore tubes this year and have to ask for 21mm bore tubes next year……

Lengthwise, I assume cutting the springs to get the extra 5mm length can be done but I suppose making the battery tube 5mm longer might be better.

[KawiBoy1428]

Got these today… real tight to the ID of my Texas Lumens light, and I even flapped and polished the inside of the battery tube, when I got it, my Sanyo 20770A’s fit no problem. Re-wraped!

The re-wrap states that the cell was made in Japan! Performs the same as my A’s!!!

[cncyana]

I think making a thicker C8 battery tube to bore out to 20 or 21mm will require a complete redo of the tailcap and tube - larger diameter tailcap threads and a tube with no flats or clip grooves.

On the other hand, the Olight M23 (an expensive but very nice host no doubt) already has larger diameter tailcap threads but the battery tube still has flats and a clip groove. Does anyone have an Olight M23 to take diameter measurements of the flats and clip groove (with boring out to 21mm in mind) ?

Here are some pics of the Olight M23 showing the larger diameter tailcap threads and the unfortunate battery tube clip groove under the grip ring:
http://www.candlepowerforums.com/vb/showthread.php?405090-Olight-M23-Javelot-(Dedomed-XP-L-1x18650-2xCR123A-2xRCR123A)-Review

Another expensive option might be the Olight M2X-UT which seems to come with a similar oversize tailcap but without the deep clip groove of the M23.