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Joker › Enlarging mini joker battery tray??
08-09-2007 03:35 PM  10 years agoPost 1
dreslism

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Rochester Hills, MI

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I am looking to stick A123 cells in my mini joker. I'd like to keep them in the default 2 rows of 5 as they come out of the dewalt packs.

They currently won't fit in the mini joker battery tray, I need 10mm more width in the tray.

Anyone have any suggestions or ideas or better yet, has anyone done this already?

Thanks,

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08-09-2007 10:46 PM  10 years agoPost 2
cfranks

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Adelaide South​Australia

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I made a wider tray of my Maxi Joker 2 (by 5mm) when the batteries I bought were larger than the advertised size and wouldn't fit. I am looking at A123's too and I think I need a bit wider tray. Relatively easy if you have a milling machine.

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08-10-2007 12:09 AM  10 years agoPost 3
dreslism

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Rochester Hills, MI

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Thanks cfranks! Can I borrow your milling machine?

Yeah, that is my last resort. I will pick up some G10 and cut some new battery compartment plates, but this is more work than I was hoping for as I need to do it with some level of precision, and I don't have a milling machine. I was just wondering if anyone else had come up with some sort of brackets/spacers to allow them to fit with the existing battery plates.

Thanks,

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08-10-2007 07:07 AM  10 years agoPost 4
Gerd

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Vellmar/Germany

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The A123 cells fit excellent in lying position (poles at the right and left side). The only you must do is purchasing 10 spacers and 10 longer screws that you add above the current spacers and U-profiles. The unusual design of the miniJoker tray is exactly the reason for that. The stock height is 45 mm. When you use the DeWalt pack, I mean this is 53mm high, you should let 2-3 mm space for the Velcro tapes. So you must now only find some spacers from our stock list (or a good friend with a turning lathe). Here some samples:
#443 4mm
#561 9mm
#990 10mm
#468 16mm
And don´t forget that you need longer screws too.

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08-10-2007 08:22 AM  10 years agoPost 5
dreslism

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Rochester Hills, MI

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The A123 cells fit excellent in lying position (poles at the right and left side).
This is exactly what I want to do, but they don't fit.

The battery tray is 45mm High x 68mm wide, the A123 pack laying on its side with some shrink around it is 70-72mm depending on how tight I got the shrink and taps down.

I can handle the height increase no problem, I just don't see how they fit in width wise?

Do you have any photos of the mini joker with some A123's in it?

Thanks!

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08-10-2007 04:54 PM  10 years agoPost 6
rroback

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Irvine (UCI), Ca

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mcmaster carr also sells threaded spacers if you want to extend it, and not have washers or anything. I just flew my mini, but on lipos, but I'm likely going to also convert to a123.

Rhett..... I can't fly, but the Profi sure can.

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08-10-2007 04:59 PM  10 years agoPost 7
dreslism

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Rochester Hills, MI

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Thanks Rhett,

Yeah Mcmaster is one of my favorites. I was looking at their spacers as I can just get new solid ones instead of stacking some smaller ones on the existing ones, I just cannot see how I can get a cell to fit width wise like Gerd had said? I don't even think a bare cell would fit in the 68mm wide compartment.

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08-10-2007 05:42 PM  10 years agoPost 8
fergus

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Ireland

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If you check the A123 packs I use (In my gallery 12s2p) The heigth of the cells is only 65mm maybe 66mm with shrink wrap. This is the distance you are measuring with them on their side isn't it?

Maybe you have thicker shrink wrap though!!

Fergus

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08-10-2007 05:48 PM  10 years agoPost 9
Gerd

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Vellmar/Germany

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Perhaps the european cells are a little bit smaller, I don´t know. I each case you must be cautious with solder and built them really accurate. And you need such cable connector tabs like shown, no cables on the poles!

Please isolate one pole of the cell(s) before you do such exercises as you see in the pic

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08-10-2007 06:10 PM  10 years agoPost 10
fergus

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Ireland

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Actually when I put a callipers across the pack the height varies depending on the solder joint. With Gerds method above you will not have this problem but I did notice the height can go out to nearly 69mm in spots on my pack:

Regards

Fergus

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08-10-2007 07:12 PM  10 years agoPost 11
Gerd

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Vellmar/Germany

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I forgot: The pack I measured on the pic has welded tabs and was built with hot glue before welding in an absolute straight help frame, they do not enlarge the height from solder, perhaps the Tanics are soldered.

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08-10-2007 07:24 PM  10 years agoPost 12
fergus

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Ireland

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You could be right Gerd. I can not say if the pack is soldered or not but the balance leads are running along the top of the pack which would also increase the height slightly. They just fit upright in the Joker2 frames.

I asked before Gerd but do your packs have balance connectors and if so which variety? Its not clear in the pic.

Fergus

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08-10-2007 09:21 PM  10 years agoPost 13
Gerd

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Vellmar/Germany

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No, we add to each pack one extra shrink tube and thin silicon cable, so everybody who will use balancers can mount them.

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08-11-2007 06:20 AM  10 years agoPost 14
fergus

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Ireland

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Thanks Gerd,

Sorry dreslism didn't mean to hijack your thread. Thought of it after I had submitted my query. I really should have put it in a new post!!

Regards

Fergus

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08-11-2007 07:40 AM  10 years agoPost 15
ThomasJoehnk

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Denmark, Copenhagen

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Hi

What cell configuration do you plan to use in the mini joker? I currently use 10s1p Lipo (EV25, 3700 mAh) because I expect that any 2p configuration will be too heavy and any 1p configuration will give very short flighttimes! Am I wrong?

(I use 13s2p and 15s2p A123's for my Joker II's with great success).

:-) Thomas



Minicopter 3D and 3DD, TDR, TRex 700E (and a full size 90.000 cubic foot hot air balloon)

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08-11-2007 10:45 AM  10 years agoPost 16
Gerd

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Vellmar/Germany

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No, you are right, 1p is relative short flightime and 2p is relative heavy.
The question of this thread was 'Does the A123 battery fit?'.
For each aerobatic with the miniJoker you should use Lipos and nothing else.
But when you need a very smooth helicopter with a long flighttime (f.e. as cameraship with a small camera or for beginners), then it could be a fine solution (and a cheap one ).

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08-11-2007 07:37 PM  10 years agoPost 17
dreslism

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Rochester Hills, MI

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I will use 10s2P. Heavy does not matter so much as my mini is stretched, and I use it for AP only.

I fly 11s lipo 5000mah (5s and 6s in series) right now, The 6s lipo pack is only 20 grams lighter than a 10s A123 pack. The 5s lipo pack is about 100 grams lighter, so overall by going to A123's from lipos for me is added weight of 120 grams for which I can live with non problem for dirt cheap A123's, very fast charge time, and safety factor.

My buddy is already flying 10s2P A123's in his stretched mini for AP and it works out great. I just need to swap out the pinion once I get these packs to fit.

No worry about hijacking my thread. This is all good info, and I appreciate the feedbac, and the pictures too Gerd.

If I have too much trouble getting them to fit, I may just break them down into shotgun style 2 rows x 5 and stick them in some MEC solderless power tubes. Then they will fit no problem, but seeing your pictures shows me they will fit knowing how to do it now.

I just need to rerun the power lead so it in not on the poles and clean up the tap wires running up top and reshrink them, then I should be good to go.

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