pjrough Posted July 13, 2020 Author Share Posted July 13, 2020 TDI is voltage dependent, so going for 16v battery pack (freshly charged 4s lipo arrangement), you will have to go for even lower delay settings. ...which kinda surprise my, because even diving in rocky areas I rarely go lower then 15uS. With voltage regulated pack I can still use TDI with low 10uS delay, just because the voltage is fixed to 13,4 v all way through the discharge cycle. Lower capacity of the battery pack in my case is due 2200mAh old scrapped cells i am using in it. It was an experiment, that turned quite successful. 1 Link to comment Share on other sites More sharing options...
Skull diver Posted July 13, 2020 Share Posted July 13, 2020 4 hours ago, pjrough said: With voltage regulated pack I can still use TDI with low 10uS delay, just because the voltage is fixed to 13,4 v all way through the discharge cycle. I was suspecting the noise was increased by adding more voltage. Also, capacity is the main factor I'm looking for. Right now, thanks to a friend, I have to the test a different creation with thin cells.This time a 3s pack. Hopefully with a little less voltage but longer lasting cells, I can squeeze out the good balance between duration/performance/noise 1 Link to comment Share on other sites More sharing options...
pjrough Posted July 13, 2020 Author Share Posted July 13, 2020 Good luck, allthrough it looks difficult to fit this battery in the TDI housing due to the battery dimensions: 88mm X 70mm X 6.3. 70mm side looks too large. 1 Link to comment Share on other sites More sharing options...
Skull diver Posted July 13, 2020 Share Posted July 13, 2020 1 hour ago, pjrough said: 70mm side looks too large With the factory operations recently closed, even the eventual future assistance is destinated to vanish...So I will check with longer cables and connectors the battery pack work for an half day and eventually dismantle the lower side of the control box...In that occasion, I might also swap the coil with a smaller one, this time a plain mono... There's a long debate on this, but I still don't find a coil that suit my needs in terms of shape and weight, not to mention delay, inductance and resistance. Link to comment Share on other sites More sharing options...
pjrough Posted July 13, 2020 Author Share Posted July 13, 2020 Looks too complicated. If vanishing the warranty, you better grind down these plastic pins in the battery compartment, so you'll be able to pack it with Samsung INR21700-50E 5000mAh - 10A valid for all day operation. Check nkon store. Whey are out of stock, but soon will be available again. 1 Link to comment Share on other sites More sharing options...
Tony Posted July 13, 2020 Share Posted July 13, 2020 I managed to get a second lower half of the TDIBH / BeachHunter ID. I drilled a small hole in the clear plastic top of the battery compartment and ran the DC barrel connector lead directly from the detector PCB battery pin to my 4S1P battery pack. You could do this with the original lower half but I had a spare. This bypasses the regular setup. Just need a separate connector/lead which is very easy to make up. Now you can use much bigger battery packs but I’m okay with the 4S1P which gives me a good 7 hours. First photo is original lower half and second is the modified....it’s only a single neat hole to run the lead through. Third photo is power source ! 2 Link to comment Share on other sites More sharing options...
Skull diver Posted July 13, 2020 Share Posted July 13, 2020 56 minutes ago, pjrough said: Check nkon store Thanks for suggestion!I already found the website weeks ago and found good prices too!So I decided to push this project. At the end of games I'll have the winner pack. I already tried 8s 1.6V Ni-Zn (too low capacity of 1.560mAh) 11s 1.2V Ni-Mh @2400mAh (burned during last cell soldering) Waiting to make/test 4s 18650 Samsung 35e @3450mAh (probably the best option with bms and regulator @13.8V and cutoff @11.5V) Last less obvious and final destination 4s 26650 5000mAh (with same bms+reg. pack) Link to comment Share on other sites More sharing options...
Skull diver Posted July 13, 2020 Share Posted July 13, 2020 1 hour ago, Tony said: it’s only a single neat hole to run the lead through. Third photo is power source ! This is the best option for effortless disconnect/recharge/connect and go cycle... Thanks ? Link to comment Share on other sites More sharing options...
pjrough Posted July 15, 2020 Author Share Posted July 15, 2020 Ok, finally, after doing some discharge and charge cycles, I can tell some conclusions. First of all - it works just great. Total battery capacity: 7.4v x 6.6Ah = 48,84wh The voltage is fixed at 13.4v. TDI power consumption (considering step up converter loss) is 6,85 Wh: My battery pack is good for 7h hunt. 48.84wh/6.85 wh = 7,1 If i would build it using 18650 with capacity of 3400mAh, it would be fine for a 10h hunt. The picture is showing charging process. The battery got 2.57Ah after 3h hunt. Here is the model of the regulator I am using: https://www.pololu.com/product/2890 3 Link to comment Share on other sites More sharing options...
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