I hope this topic hasn't already been covered and I'm not writing it in the wrong place.
Recently, based on my lack of knowledge in this sector, I have however noticed large differences in actual life, not only because of battery chemistry ...
I mean something about the use of power itself in using the tool.
Thinking of a mobile phone, the standby time is merely relative to the battery capacity, as is the duration in call or video call, much less long ...
So every time a detector is used in an area where there are several signals and we are busy digging or at least hearing many of them, the battery duration is more affected and reduced...
This for me, as an inexperienced, means not being able to have a clear measure of the actual duration of the battery pack ... You can never know regardless of how many signals will pass below the coil ...
So I then discovered the natural drop in voltage, added to that of absorption in the most arduous use ...
And what about threshold instability and false signals if, for example, a pulse is not properly regulated and a too low delay makes it continuously sound for nothing by activating the retuning?
At this point I have the impression that even with higher capacities, the voltage drop is the most difficult factor to defeat, even before the capacity ....
I am facing the insertion of bms modules in these days and in the future I could add step up or step down modules if necessary, but first I would like to understand to what extent it is possible to delay the cut off, if not eliminating some form of protection that these boards cut away leaving a lot of useful voltage.
Unprotected batteries can have a bad end if it is lithium, so there is a compromise between safety and durability ...
I repeat again ... I am not an expert and anyone who can add his knowledge on the subject, do it without brakes because I am well open to constructive technical comments, or even comic and bad ...
By Steve Herschbach
Well, I may have blown it. Almost seven weeks ago I ordered the Pulsedive pinpointer and 5" coil package plus the 8" coil on Amazon. Amazon split the order between two suppliers. The 8" coil was shipped from Sports365' - not sure who that is other than an Amazon vendor, as the site provides no real info.
Well, the stuff showed up just over a month ago, but I've been very busy with new detectors and classes. It all sat unopened. I finally got around to opening it all up, and when I pulled the protective cap off the end of the 8" coil small plastic parts fell out. Somewhere between Turkey and my doorstep it looks like something must have hit this thing on the end hard enough to break it.
Over a month since I ordered.... I'm probably screwed. But I sent a message today via Amazon to the vendor to see what if any response I will get. I'm afraid this will end up being one of those lessons learned. I can't believe I did not open immediately but it is such a minor item and it's been so long since I had anything wrong brand new in the box that I got lax.
I'll let you all know what the vendor says. I guess I at least have the Pulsedive and 5" coil in good working order.
By Steve Herschbach
Click or double click any photos in this article for high resolution versions.
I bought this 4 x 26650 battery holder on eBay after quite a bit of Google work. They are a surprisingly rare item. It comes with sleeves that can use 4 x 18650 batteries also. It ran me $29.65 delivered including shipping and tax. I ordered it on June 25th and it arrived from China on July 14th. The holder delivers 16.8V via a DC adapter plug or 5V via a USB outlet. It has a thin oring on the lid for an IP67 seal.
I also ordered an IP67 M8 4 pole 16.4 foot female to pigtail cable from Automation Direct for $10.50 plus shipping and tax. I ordered several different cables so lets add $5.00 for s&h for this one cable. They delivered next day!
And finally 4ea EBL 26650 batteries from Walmart for $20.99 free shipping, delivered in a few days.
Total parts cost about $70. I have a 26650 charger already that came with my Tarsacci so you'd have to figure that. Some sets of the batteries come with a charger. By the way, the EBL seem in short supply lately.
I shortened the power cable to 5 feet, more than enough to set the detector on ground if need be. The DC adapter that comes with this battery box is great. Blue wire to negative post and brown wire to positive. Warning - I am not vouching for the polarity. I used a multimeter to check my AQ battery and matched that. You should do the same. I take no responsibility for anyone doing this mod and blowing their AQ! The black and white are headphone wires. I hooked up a 1/4" female jack to those.
I am using the AQ mostly as a wader unit employing some true chest high waders that have a big pocket on the inside front. I'll drop this battery in that pocket and plug my Sun Ray Pro Gold headphones in. I could use my TaoTronics to go wireless, but that seems pointless the way the battery is mounted near my head. I need to determine run time with four 26650 batteries - should be way better than the current 3 (all metal) to 3.5 (tones/mute) hours running time I get with the Fisher battery. Enough that I probably will not need to do a battery change at all and perhaps enough for a long day. I also need to determine how the detector handles without a battery under the elbow. Lighter of course, but too nose heavy? Should be fine in the water as the coil is neutral. Maybe too nose heavy for some people for dry beach use. We will see. This would be a great belt hip mount battery for dry beach use. I suppose it could also be mounted under the elbow, perhaps with the included strap, so I'll consider that also. It would balance well like that. It is IP67 rated and with proper headphone / power cables might be good enough to use under arm for wading / shallow dunking use at least.
Operating sequence. Power up battery pack (it has its own power switch) then power up detector. Power off detector, power off battery pack. Doing otherwise may trip the circuit protector on the battery pack, necessitating removing and reinstalling the lid to reset. The pack has its own built in battery level indicator. And it may be used to charge a phone or other USB device! I was warned this USB capability might create interference in the AQ, but that has not proved to be an issue so far. The two circuits, 16.8V and 5V, appear to be isolated.
Powered up - and no smoke!
I really like this. Very easy for a not super skilled person like me to do, less than third the cost of a spare AQ battery, and should get well over twice the run time. If I had another complete set of batteries ready, it would be an easy swap for even more running time. It leaves only one cable to the rear end of the detector, and that is my only concern at all - I will try and beef that up and protect it better. I'm thinking a rubber boot that clamps completely over the end of the detector rod. I ordered a couple like like the one pictured below to see if it will stretch enough to work. Long story short is there is a very good chance this will replace my Fisher batteries for most of my use. This is why I had no problem getting the Limited "wader version" of the AQ as I find chest waders to be a good option at Tahoe and it's cold water for all but a couple months of the season when the water gets reasonably warm for mask and snorkel work. I used to do a lot of ice diving with drysuits while gold dredging, but am not looking to get quite that serious any more.
Joe’s Fully Waterproof 26650 Alternative
100% brand new and high quality.
Without 18650 battery. You need to prepare 4x 18650 or 26650 batteries yourself to use.
DC 5.5x2.1mm interface has input and output functions, with DC adapter, easy to use.
DC 5.5x2.1mm port for 16.8V devices
USB 5V Port for Charging Smart phone GPS Tablet PC or 5V LED Light and more.
Improve replacement battery pack fixes inconvenient shortcomings, greatly facilitates the users of the battery pack DIY requirements, without spot welding battery, thereby greatly reducing the battery internal resistance, improve the battery discharge performance, so as to effectively improve battery life
Power supply: you can use 18650 rechargeable lithium battery as a power source
The output side: USB and DC dual output power supply function,DC output voltage is 16.8V(can power the 16.8V device, such as the bike light), USB output voltage is 5V(can power the cellphone and other 5V device), to meet a wider usage scenarios, the product comes with overcharge and over discharge protection, protection of the battery is more safe and sustainable
Color: Black or Red
Input Voltage:DC 16.8V
Output Voltage: DC Port 16.8V
Standby current Under 80μA
USB Output Voltage: DC 5V
USB Output Current: 2000mA
Overcharge Protection Voltage: 16.8V
Over Dischage Protection Voltage: 10V
Over Current Protection Voltage: 7.2A
Size: 9x6.5 x 6.5cm
Cable length: 29cm
18650 and 26650 Batteries are not Included
Please put in battery in a right way.
Charge it when power indicator light flashes.
Don't use the device in the water. Waterproof standard is IP67
1x Waterproof 4x 18650 /26650 battery box case.(without battery )
1x 5.5x2.1mm adapter
4x 18650 to 26650 battery converter
By ☠ Cipher
Well, I took the plunge and bought my first Nokta-Makro product. I went to my nearest dealer and he had one left. Just the base pinpointer without coil. This actually worked out better for me because I was primarily interested in the 8" coil and didn't want to have to purchase the 5.5" which I doubt I'll ever use. So I paid just $99 for the base unit and he ordered me a coil for $84. This way I pay $183 and get the coil I want, rather than $160 and $84 = $244. Doing it this way, you would not get the nifty carry case however. You'd have to order that separate if you want it. In a few days when the coil comes in I'll leave some thoughts on that.
For now, I'll say this and rather begrudgingly...I think this pinpointer is the best deal going right now, even if you don't want the full setup and just want a pinpointer. Like every other NM product released particularly over the last couple years it's very well built, and it is built with the future and innovation in mind. I didn't want to like this company, for a lot of reasons, but they have more to do with my own sentimentality for American and even Western products. Particularly here in the US I didn't want to see companies like Whites boxed into a no win, no profit situation. So, it's never been about performance. I watch the forums and social media enough to know the performance and build quality was there. I needed a product I just couldn't resist. At first I thought that might be an Anfibio or a Simplex, but even they haven't broken down that wall. The original full Pulsedive was already almost too good to resist on its own. Then when Dilek quietly announced the 8" coil and I saw the evidence that it was boosting depth by 30% and coverage too obviously, that set me over the finish line.
We know what an underwater metal detector costs in this hobby. Their are competing products that don't offer this much, at a far greater price. Many people seem to do quiet well with just straight forward Pulse induction, and you can't beat 60m (200 feet). Let's face it, if you're looking for lost jewels or a ship wreck, disc is probably mostly out of the question anyway. It would be for me. So not only will this be a pinpointer for me, it will likely be my anything past 10ft primary diver for a while.
The base unit is rather large for a pinpointer, but that's to be expected with something that converts to another form, and I don't mind that at all. There's also a possibly unintended advantage here where if any part of this machine fails, it's so compartmentalized you can replace it rather cheaply and easily. The unit feels good in the hand and to me is easy to program/adjust. So far, I have done limited depth comparison, but it seems to be on par with some of the more powerful pinpointers, like my TRX and Tek-Point. If straight up pinpointer depth is all that matters you still seem better off with a TRX, but not by much at all now. That gap is closing and could probably be filled via software at some point. Like the TRX, you can replace any wearable external part on it, including shell. Unlike the TRX you can add on to this (probably in more ways than coil in the future), possibly update its software?, recharge its built in lithium ion battery, pair it with existing and future products, and clearly see it's flashlight. $99 vs $160 bear in mind as you process that. With the base pinpointer I got two caps, several gasket seals, a lanyard, charging/update facility cord, and a well constructed holster. I have no complaints about field performance. Like the TRX and Tek-Point, The power is there to pinpojnt objects above the ground before you ever begin to dig. If you're one of those that thinks that's too much power for a pinpointer, you can dial it back as much as you like too. I do prefer a tip only pinpointer, but I'm not much bothered by those that detect along the entire shaft either.
These are my initial impressions. They may be better classified as a value comparison, but I'll leave that up to Steve. I'll share more of the smaller details and coil info when it comes in and I gain more experience with it. At this point though, if I were just starting out, or needed 1 good pinpointer, I think I'd be foolish not to consider this the best deal out there and a no brainer If it could be my only unit. I don't see myself parting with the TRX because it still is the flat out depth demon and I admire it just as a pedal to the floor piece of technology. I do think I will be parting with my Tek-Point however if all else goes well here. This is what any future Tek-Point needs to compete with though, and that's not about depth either. Tek has the punch. It's the innovation and features that set it apart.
Update: initially I assumed updateable software thinking I'd read that somewhere. I'm not sure this is the case, and may have mixed up descriptions in my head. I haven't been able to corroborate that yet.