2/3 AA Cells in a AA pack,, issues?

[Databyter]

I'm trying to build a Mag623 based on the 15.6 V solution (original torch was 14.4, alot easier to manage)

I was wondering if anyone has ever tried taking a series FM adapter such as the 12AA to 3 D (for quad bore) and instead using 2/3 AA cells and spacers to make anything up to 19.2 volts depending on dummies and spacers.

It seems to me like it would work ok, Of course I'd dummy it to make 15.6 Volts.

The advantage for me is that I really don't know how to solder batteries together and people on the forum don't do it much anymore. The 15.6 pack is also kind of a problem for a newbie to pack making since it is made with 12 in series based on 3 or 4 columns (tri or quad bores) with a button cell like a 4/5 Sub C on the bottom.

If I can use a cool high capacity Battery Holder like FM sells in a bored out mag host with 2/3 AA cells instead of AA it seems to solve my problem.

So, Am I missing anything? Have any of you done this?

I know that I will need to secure the cells at the side somehow since the spacers are spaced to hold the AA contact points , tape should work fine for that.

 

[Databyter]

2/3 AA's In A FM AA Holder Instead Of A Custom Pack?

I want to build a Mag 623.

I want it to be based on a 3D or less length.

Since no-one makes those nice custom 15.6 V packs anymore, and I'm not really sure how to solder batteries without making a mess and destroying them, I'm looking for an interim solution (I'll buy a pack when I see em for sale again,. If)

And I was thinking what would not work about using a FM battery holder based on 12 AA's, but instead put 2/3 AA's into it (and maybe a bit of tape to hold it tight where the Batt's meet since the holder is designed to secure AA's).

I could have a quad bore 3D host and a FM 12AA to 3D Batt. Holder with a few spacers and dumies in it to achieve 15.6.

Anybody see a flaw in this?

 

[Conte]

Re: 2/3 AA's In A FM AA Holder Instead Of A Custom Pack?

If it fits, why not ?

You might also consider that you can fit 4xIMR26500's in a 3D with a minor tail cap mod to drive a 623 or 633.

I'm assuming you are already planning to use some for of softstart or regulator switch to run it.

 

[Databyter]

Re: 2/3 AA's In A FM AA Holder Instead Of A Custom Pack?

If it fits, why not ?

You might also consider that you can fit 4xIMR26500's in a 3D with a minor tail cap mod to drive a 623 or 633.

I'm assuming you are already planning to use some for of softstart or regulator switch to run it.

Yea, an AW Switch.

I want to go with 15.6 Volts to push the Bulb a bit, so the IMR's wouldn't quite do it, Plus I already have a smart charger for the Nimh pakcs, heh I know Ill spend a fortune anyway, but if I can save 30 bucks and use the same charger, woot!

As far as fitting, it should fit with room to spare, I just need to figure out what to use for spacers. It's probably best to get all the parts first and then just measure, I'm thinking small copper tubing wrapped in something to give it girth.

 

[jaundice]

Re: 2/3 AA's In A FM AA Holder Instead Of A Custom Pack?

Databyter;

Keep in mind that fully charged, 4x26500s are 4.2v each, or a total pack voltage of 16.8v. A softstarter will allow this to work, but putting a load on the cells gradually, causing the pack voltage to sag under load before the softstart goes to full power, preventing the bulb from flashing. Anyways, you'll probably get a comparable experience with 26500s, and for less money, too. The cost of a bored maglite will run $60, plus the battery packs are even more money. 4x26500s are only $65, shipping included, and they fit in a 3D mag with no modification.

There's a Mag623 for sale, used, on the marketplace right now for $100. I almost bought it, but ended up going for my own build. The one on the marketplace is already tri-bored, and all the other parts. No battery pack, though. It's a good deal, and the seller VWdr, is in socal, so maybe he's local.

Good luck,

-John

 

[Databyter]

Re: 2/3 AA's In A FM AA Holder Instead Of A Custom Pack?

Databyter;

Keep in mind that fully charged, 4x26500s are 4.2v each, or a total pack voltage of 16.8v. A softstarter will allow this to work, but putting a load on the cells gradually, causing the pack voltage to sag under load before the softstart goes to full power, preventing the bulb from flashing. Anyways, you'll probably get a comparable experience with 26500s, and for less money, too. The cost of a bored maglite will run $60, plus the battery packs are even more money. 4x26500s are only $65, shipping included, and they fit in a 3D mag with no modification.

There's a Mag623 for sale, used, on the marketplace right now for $100. I almost bought it, but ended up going for my own build. The one on the marketplace is already tri-bored, and all the other parts. No battery pack, though. It's a good deal, and the seller VWdr, is in socal, so maybe he's local.

Good luck,

-John

Yea I'm open to other options again, I just realized my greatplan is stupid. I thought that there was a 2/3 AA, I was reading it wrong the one that I was thinking of is a 2/3 A, which is alot fatter, so it would not interchange with an FM holder.

You gave me some food for thought though, I can use more cells with the AW switch I'm getting, I'll just use the lower settings when the pack is hot.

 

[Databyter]

Yea I'm open to other options again, I just realized my great plan is stupid. I thought that there was a 2/3 AA, I was reading it wrong the one that I was thinking of is a 2/3 A, which is alot fatter, so it would not interchange with an FM AA holder.

Back to the drawing board, If I get a 4 D my problems would be over heh.

 

[Conte]

Re: 2/3 AA's In A FM AA Holder Instead Of A Custom Pack?

I've tested the IMR Setup. Fresh off the charger, they'll give you bang on 15.5volts under full load. And I was testing them with a 150watt 633 bulb.

 

[rmteo]

2/3AA cells are available, not great capacity though http://www.batteryspace.com/nimhrechargeablecell23aa650mahrechargeablebatteries12pcs.aspx

 

[DM51]

You've posted 2 threads about this; I'm merging them.

Please read Rule 9. You've been a member long enough to know that cross-posting is prohibited.

 

[Bullzeyebill]

2/3AA cells are available, not great capacity though http://www.batteryspace.com/nimhrechargeablecell23aa650mahrechargeablebatteries12pcs.aspx

See this site, and scroll down to Elite 2/3A 1500mAh cells. http://cheapbatterypacks.com/?menu=76620DD738&sid=135677

Bill

 

[rmteo]

We're talking 2/3AA here.

 

[swampgator]

We're talking 2/3AA here.

His photo shows 2/3AA.

As posted above available at CBP.

Dimensions: Length 28.45mm, width 13.97 mm, capacity 700 mAh

 

[Databyter]

You've posted 2 threads about this; I'm merging them.

Please read Rule 9. You've been a member long enough to know that cross-posting is prohibited.

I'm sorry about that. I should have deleted the first one.

I wasn't sure which section to post it on. It won't happen again.

And those 2/3 aa cells are EXPENSIVE as well as being very low capacity.

I may have to go with another chemistry or get a 4D, but, ugg, even my 3D mag 85 is a bit heavy, I can imagine how a 4D would be.

And I just found out Cheapbatterypacks.com will NOT make the Torch+1 style packs, unless I was talking to the wrong boob over there. He says the cells can't be mixed because they are different capacities, even though the specs show the same capacity and almost identical discharge rate/resistance. That is by the way in this case for 3D a pack I was trying to get them to make which is 4 thick square 1700 MaH AA Elites X 3 long (12), + one 4/5 subC at the end of the pack (also 1700 MaH).

 

[rmteo]

His photo shows 2/3AA.

As posted above available at CBP.

Dimensions: Length 28.45mm, width 13.97 mm, capacity 700 mAh

Huh :confused:

 

[Bullzeyebill]

Whoops, sorry about that 2/3A - 2/3AA mixup. Didn't read the fine print. LOL

Bill

 

[swampgator]

Huh :confused:

On the link I provided, top row, third from left, click the specs. These were the numbers listed.

 

[LuxLuthor]

I'm planning on making some packs this weekend, and I know there are at least 4 that want one of the 13 cell.

 

[Databyter]

I'm planning on making some packs this weekend, and I know there are at least 4 that want one of the 13 cell.

Woot!!:thumbsup: Count me in, In fact I may get more than one!
lovecpf