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#1

XLOOX
Member
From: Inglewood Fault, QLD
Joined: 21 August 2019
Posts: 13
Member
21 August 2019 05:51 pm

Folks, Here is a 16V 18650 battery holder for the TDI SL that you can make at home in about an hour.

You will need a set of 4 decent 18650 batteries such as Panasonic NRC18650B (PCB protected 3400mhr) ~AUD$40 and a Whites #802-7150 8 AA battery holder AUD$30.

1) Take your battery holder and with the holder closed and empty slowly & carefully drill thru the embossed Whites symbol on the slide lid using a drill bit 10mm or so, the size is not too critcal. This will remove the little plastic protusion on the underside of the lid which prevents the lid being fully removed.

2) Slide the lid off.

3)All the metal fittings in the case are simply held by friction & if you use a scribe or similar to slightly bend up those little tangs you will easily pull off all fittings with a pair of long nose pliers.

4) Lay your 4 x 18650 batteries as shown in the photo. Take a dremel & cutoff knife and cut out all the reinforcing ribs etc that prevent you laying the batteries neatly in position. Dont cut more than needed.

5) Using the dremel with a cutoff wheel cut a 15mm wide slot thru the case bottom. The slot is centred on the centreline of each pair of batteries. These slots are needed to allow the batteries to sit low enough to slide the cover back on. They also act to hold the batteries laterally once the lid is in place.

Now we need some terminals.

6) For the back end of the battery where we need to join the 2 strings of batteries together just cut a rectangular piece of thin copper strip to fit across the whole back and solder a couple of ~3 x 3mm pieces of copper strip onto the main strip to raise the surface enough to contact the battery terminals.

7) For the front terminals I used the existing Whites +ve & -ve terminals but cut the sides off & bent them to fit and hold the batteries firmly. WARNING. The terminals are made of the most brittle metal I have ever seen. Cold bending is totally out . All bending to be done after heating with a mini gas torch. If you break the Whites terminal a simple U shaped piece of ~3mm wide springy steel or brassy strip wil work just as well.

8) Load the batteries & slide the lid on. If the lid wont go on then check where the batteries are sitting high & cut another mm out of the base slot(s).

9 Once assembled check continuity ie should have 16V at the terminals. Shake the battery around and recheck voltage. If all good you can superglue the back terminal in place. If not then one or more batteries are not touching their terminal. Issue can only be either battery being obstructed by some plastic or insufficient pressure from the front terminal, which acts as the spring. A bit more dremmeling or bending and all will be sorted.

I get 5 hrs runtime from this pack down to 13.8V. Note that you CANNOT rely on the Whites battery light as that is set for 8.5V.

Using a NF Sadie & compared to the Whites NiMH battery pack, depth on a 1 grain 24k ingot goes from 45mm to 60 mm and depth on a 1/2oz 30mm dia 24k coin goes from 220mm to 250mm. Max depth on massive iron goes from 400 to 500mm.

Ok its not a Minelab but its probably the next best thing.

1566370137_20190821_114203.jpg
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1985-2005 Garretts ADS Deepseeker - now THATS a slow learner !
2017- current Whites TDI SL +Sadie , TRX

3 users like this post: Ded Driver, karelian65, mbasko

#2

Jaros
Moderator
From: S.E.Qld., QLD
Joined: 11 August 2013
Posts: 11,460
Moderator
21 August 2019 06:00 pm

Welcome XLOOX. smile


F1A4M2, Exterra 705 Gold, Ace 250, Goldrat 8" Dreammat River Sluice.

#3

Ded Driver
Member
From: West of the Border, WA
Joined: 27 May 2018
Posts: 2,189
Member
21 August 2019 06:10 pm

Welcome to PA XLOOX & cheers.
that's fairly well what I had in mind to do for my MXT Pro, although with either 3 or 6 batteries (for 12.6V)
handy to see an example already done thumbsup


APLA member, GPX4000, modded SD2100, XTerra705, GM1000, Whites MXT Pro, Nokta Pointer, sP01 Enhancer, Garmin GPSMAP 64S, kti PLB, a map, all sorts of coils & a cupla buckets full of hope & enthusiasm

#4

karelian65
Member
Joined: 16 January 2017
Posts: 101
Member
27 August 2019 08:06 pm

XLOOX what a great and simple low cost design, I'll look at sacrificing a spare battery holder since I've got everything needed for this project.
Those Panasonic NCR18650B cells that you use are the type without the nipple? I've got a variety of cells and my nipple variety probably won't fit, need the flat ones for a still reasonably tight fit.. I've been carefully measuring everything so I thought I'd mention that some protective 18650 cells with nipples may not fit. I'm looking forward to having a good go at this project, thank you XLOOK.

All the best,
Karelian

1 user likes this post: Ded Driver

#5

karelian65
Member
Joined: 16 January 2017
Posts: 101
Member
29 August 2019 05:34 pm

Thanks you again XLOOX, I am almost finished. When the postie delivers my ultra thin carbon fibre I'll complete the project. Just cosmetic changes on my project, got the slide lid off without drilling and just cut the notch off. Will post again when 100% finished. 1567059897_img_1286_edited.jpg

Must heat the connectors so they don't break, as stated, you have been warned.. Use quality copper not too thin or thick. I went with .4mm. Used a punch on the soft copper for better connections at contact points. Lots of tension so the flat cells have good connections. 16.48 volts using not fresh cells, they have been sitting for a while. I'll go again when I'm finished with hot off the charger cells..
Got to be happy with the voltage. Full credit to XLOOX for a quick and simple solution.

All the best,
Karelian

#6

karelian65
Member
Joined: 16 January 2017
Posts: 101
Member
03 September 2019 02:45 pm

Carbon fibre had arrived and apart from cosmetic changes this is the XLOOX design, thanks to him for making it easy. Final images of the finished product. Carbon fibre covers the channels cut out for the batteries and is used for a new cover replacing the White's original. Karelian1567482081_img_1310_edited.jpg1567482096_img_1313_edited.jpg1567482111_img_1314_edited.jpg1567482127_img_1315_edited.jpg

3 users like this post: Ded Driver, nesral, mbasko

#7

XLOOX
Member
From: Inglewood Fault, QLD
Joined: 21 August 2019
Posts: 13
Member
03 September 2019 10:04 pm

Hi Karelian,

I am so happy to have been able to help you as I have been reading your TDI posts since 2017 and your comprehensive coil tests is the reason I got a Sadie ( which I think is perfect for the SL both in terms of weight and performance).

As you know by now the Panasonic NCR18650B has nipples but still fits in the adapted case.

BTW your case is a MUCH more professional job than mine - Nice !

Would you be able to post the depth you get with the TDI SL + Sadie+16V battery for the 1 grain ingot, 1/2gram coin & AUS penny ? That would really be appreciated.

Break/Break

Before I adapted the AA case I wanted to see if the 16V battery delivered a benefit so I made up a "temporary" 16V system which actually worked quite well so for those who want to try out a 16V pack without totally butchering their AA case then see the attached photos.

The dowel is 14mm ( same dia as AA battery) and is cut to be as long as 2 AA batteries. I soldered a piece of copper on to the wires and glued them to the dowel but frankly stripping the wire bare and holding in on the dowel with a wrap of tape would be just as good. The wires are 20cm long which is just enough without having any loose to snag branches. A strip of duct tape over the wire after loading ensure all remains intact during a hard day bush bashing.

The 4 cell 18650 case is from Ebay - $7. The batteries are held quite firmly by the case but I added a strip of velcro tape to be sure.

The case held to the detector just with a screw thru the stand strap. You do need to make sure that you slightly undersize the hole so the screw cuts its own thread.

You do need to cut a small groove in the back of the AA case so the wires can feed out with the lid on and also need a small slit in the middle of the battery compartment door as far as the right angle, again to allow the wires to pass thru.

have fun !

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1567508240_20190813_142445.jpg


1985-2005 Garretts ADS Deepseeker - now THATS a slow learner !
2017- current Whites TDI SL +Sadie , TRX

1 user likes this post: karelian65

#8

XLOOX
Member
From: Inglewood Fault, QLD
Joined: 21 August 2019
Posts: 13
Member
03 September 2019 10:21 pm

Hi Karelian, forget about the test request I made in the above post.
I see on the 6" Coiltek post you have already done a thorough job in your usual manner smile
thanks


1985-2005 Garretts ADS Deepseeker - now THATS a slow learner !
2017- current Whites TDI SL +Sadie , TRX

#9

ProspectVic
Newbie
Joined: 16 September 2019
Posts: 7
Newbie
20 September 2019 07:46 pm

Hey guys, will this 16v mod still charge via the supplied whites charger or are they a pull out and charge.

#10

karelian65
Member
Joined: 16 January 2017
Posts: 101
Member
20 September 2019 08:52 pm

Pull out and charge, major advantage in choice of 18650 cells and the ability to carry spares to swap out in the field. Karelian

#11

ProspectVic
Newbie
Joined: 16 September 2019
Posts: 7
Newbie
20 October 2019 11:36 am

Gidday Karelian, I am not understanding the contact points in this picture, is it just the + & - at one end that are the contacts or is it both ends? I see there is a long piece of copper running across both ends of the batteries, do they make contact? Running a piece of metal across negative and positive dont make sence to me, I am a little naive wen it comes to this stuff.

Cheers mate
Len

Last edited by ProspectVic (20 October 2019 11:39 am)

#12

karelian65
Member
Joined: 16 January 2017
Posts: 101
Member
20 October 2019 12:41 pm

I'll include better images and one with a diagram. The copper at one end just bridges the batteries over to the other end. Hopefully the images make it much clearer. Karelian.1571535520_img_1467_b1.jpg1571535539_img_1472_b2.jpg1571535553_img_1478_b3.jpg1571535568_img_1479_b4.jpg1571535580_img_1483_b5.jpg

1 user likes this post: Jaros

#13

Ded Driver
Member
From: West of the Border, WA
Joined: 27 May 2018
Posts: 2,189
Member
20 October 2019 01:04 pm

ProspectVic, to help clarify, by bridging one end this connects all the batteries in series which adds the voltage up, thus giving the ~16Volts


APLA member, GPX4000, modded SD2100, XTerra705, GM1000, Whites MXT Pro, Nokta Pointer, sP01 Enhancer, Garmin GPSMAP 64S, kti PLB, a map, all sorts of coils & a cupla buckets full of hope & enthusiasm

1 user likes this post: karelian65

#14

ProspectVic
Newbie
Joined: 16 September 2019
Posts: 7
Newbie
20 October 2019 02:23 pm

Oh. Thanks Dad Driver

#15

ProspectVic
Newbie
Joined: 16 September 2019
Posts: 7
Newbie
20 October 2019 02:30 pm

karelian65, thanks so much man, that really helps out, I can make one 2day now. Bloody rippa.
Do you gold detect, have you noticed a difference with depth and signal? I only search for nuggets with mine, no biggies yet, largest being under a gram, smallest being 0.1g.

Last edited by ProspectVic (20 October 2019 02:30 pm)

1 user likes this post: Ship of fools

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