Tony Posted September 15, 2018 Author Share Posted September 15, 2018 Some good information here....I used to run the Beach Hunter 300 so I am used to the positive buoyancy. I use an "S" shaft when in the water as I find it easier to leverage more downward force if needed. On the beach itself, I will carry a spare battery pack (sealed in ziplock bag) but in the water, the 4 x 18650 (3300mah measured) should give me 6-7 hours run time. .............now, if you'll excuse me, I'm off to the beach ! Tony Link to comment Share on other sites More sharing options...
pjrough Posted September 15, 2018 Share Posted September 15, 2018 7 hours ago, GB_Amateur said: . ? Since you need the extra weight to avoid buoancy can you add even more batteries? That's the plan! I'll try to add as much as the compartment allow me to... Link to comment Share on other sites More sharing options...
Tony Posted September 15, 2018 Author Share Posted September 15, 2018 Just got back from the beach....in one word.........awesome. Some observations; It is the deepest detector I have ever used on the beach (in the past 25 years) by running the higher voltage pack. It is the first time I have ever detected (with any detector, including the Minelab PI's) my gold wedding ring at a measured/buried 18" deep. The US nickel can be heard at 16" in buried wet sand...but with GB OFF. With GB ON it drops to 12"-13" ! My machine is much deeper with GB OFF across all targets.....the rock solid threshold with GB OFF is unbelievable with no loss of sensitivity. Even with the coil swept through shallow salt water at max gain and 10us......it is so smooth. I don't know how White's have done it....maybe a new batch of the latest flux capacitors...... I tried with GB on but in clean white sand, there was no perfect GB....it was close but just a slight positive signal as the coil was lowered to the ground...but the depth loss was significant with GB on and slight falsing with higher GAIN. None of this is a problem with GB OFF. Tony 3 1 Link to comment Share on other sites More sharing options...
pjrough Posted September 15, 2018 Share Posted September 15, 2018 Ok, that's what I was expecting: 8 X 18650 fits to the battery compartment. Thus looks I will solder 4s2p battery pack. Don't know for the moment how I will hook up the wires to power up the metal detector. Possibly just will make a thin adapter for the standard contactor pins. Not sure if I will power up the TDI with 16.8v, but maybe will use a sort of step down converter or a simple diod to bring the voltage a little bit down..... Link to comment Share on other sites More sharing options...
Tony Posted September 16, 2018 Author Share Posted September 16, 2018 I am currently monitoring the run time on my 4 x 18650 pack. If I can get around 6-7 hours before the overall pack drops below 12v then I am happy. The Panasonic 18650 cells have the inbuilt low voltage cutoff at 2.5v per cell or 10v overall but I plan to build in more safety margin.....more details soon. Back to your last post.....I was trying to work out how to connect directly to the detector's contact pins but it is not easy. One way is to try different size female spade connectors (or similar) and with very long thin nosed pliars, reach down and gently push the (pre-wired +-) connectors on...........fiddly but workable with the right tool. 1 Link to comment Share on other sites More sharing options...
pjrough Posted September 20, 2018 Share Posted September 20, 2018 WHITE'S #TDI_BEACHHUNTER li-ion battery pack 6x18650 3s2p 11.1v 6000 mAh. The battery is not finished yet, but it works. Fits snugly into a housing. Plastic piece where the contacts are placed is 3d printed out of ABS plastic. image hosting 4 Link to comment Share on other sites More sharing options...
Tony Posted September 21, 2018 Author Share Posted September 21, 2018 If you ever want to make and sell some of those 3D end pieces, I'd be interested. Nice work, Tony Link to comment Share on other sites More sharing options...
Tony Posted September 21, 2018 Author Share Posted September 21, 2018 On 9/16/2018 at 2:11 AM, pjrough said: Ok, that's what I was expecting: 8 X 18650 fits to the battery compartment. Thus looks I will solder 4s2p battery pack. Don't know for the moment how I will hook up the wires to power up the metal detector. Possibly just will make a thin adapter for the standard contactor pins. Not sure if I will power up the TDI with 16.8v, but maybe will use a sort of step down converter or a simple diod to bring the voltage a little bit down..... 8 x 18650 can fit but very difficult with the balancing wires or BMS fitted. I am happy with the 4S1P setup......7 hours run time at the higher voltage. Easy enough to swap out fresh batteries on the beach and away from the water. TDI platform is safe at 16.8v. 2 Link to comment Share on other sites More sharing options...
pjrough Posted September 21, 2018 Share Posted September 21, 2018 11 hours ago, Tony said: If you ever want to make and sell some of those 3D end pieces, I'd be interested. Nice work, Tony Hi Tony, Can email the STL file, so you can 3d print it in your city.... ... And yes, it' quite tricky to fit 8 X 18650. Dropped this idea for the moment, as 6x pack has already huge capacity 1 Link to comment Share on other sites More sharing options...
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