Homemade Battery For Impulse AQ Ltd

[Steve Herschbach]

On 5/30/2020 at 3:20 AM, PimentoUK said:

I think one thing that has to be considered is the current draw from the battery pack. If you make a longer cable from battery to detector, you have to keep the voltage drop low, by using thicker cable.

Your suggestion that two wires are power, two are audio, may be true, it is a simple solution. But only one wire is truly needed for audio, as the battery -ve ( or +ve ) could in principle be used as the earphone ground.
This then creates a few other possibilities:
Double ground wires for a more solid connection ?
Using a wire for digital data transfer to a security chip in the battery, to stop aftermarket battery manufacture?
Adding a temperature sensor in the battery would be one way of allowing the battery to be fast-charged ( in addition to the common voltage measurement method ) , this could be connected to a pin on the battery connector, but obviously wouldn't be wired to the main detector.
The audio amplifier may be located inside the battery pack, much like the Fisher F75 / Tek T2, and some of Minelab's gold machines.
There's also the possibility of future stereo audio, so perhaps two audio wires could come from the detector to the battery. ( Would some type of mixed-mode, or other stereo technique be useful in the prospecting variant ?)

As a way of giving me more future options, I would have designed with a 5 pin connector from battery to main detector.

 

3 hours ago, Willy said:

No mystery in the battery pod. Just the battery pack with their integrated charge management, no audio amplifier.

[Rick K - First Member]

DBC - the rod end connector is potted with epoxy internally. Changing the connector would be a big job and Poof goes your warranty - and maybe your detector.

Also, the battery pod is exoxy filled, so opening it and replacing the batteries with something else is likely impossible to do non-destructively

[Steve Herschbach]

Photo courtesy of Rick....

[Steve Herschbach]

The battery is slotted on top, and there are two big knobs on the side just under the armrest that tighten clamps that fit into the channels on top of the battery. Just slide it in, tighten two knobs, attach cable, done.

Photos below courtesy Rick Kempf

Fisher Impulse AQ Limited battery attachment clamp/knob

Fisher Impulse AQ battery top showing attachment channels

[Tony]

On 6/1/2020 at 3:32 AM, Steve Herschbach said:

Like I said earlier, where there is a will, there is a way. 

A small otter box and these connectors, plus some 18650 batteries... done. If anyone has a better idea for connectors that do not involve Aliexpress I'm all ears.

Some of the best Underwater cylindrical enclosures and fittings come from Blue Robotics...high quality and very high depth ratings. Check out their range.....impressive. Perfect for an 18650 cell setup.

https://bluerobotics.com/store/watertight-enclosures/2-series/wte-vp/#tube

[Tony]

Diameter starts at 2” and just under 4” length ....certainly would allow for a very decent sized battery which would be good for water work with long hunt times. 
One draw back is losing the nicely streamlined OEM battery pack.

[Joe Beechnut OBN]

On the List and hope to see the "AQ" someday, ...for right now working on a battery from what I have seen of the pictures posted and information shared. Battery is a LiPo 14.8 volt 2200 mAh ..... Found a M-8 4 pin cable... IP69K ...that will allow me to run a 90 out the back (Power/HP cable) to the battery which will set under the arm cuff but further forward the cables are more protected. The cable is Rated at 30v at Max current load of 3 amps. The only bad it is day glow orange. 

 

[Tony]

And then 3D print a suitable mounting bracket.....?

[Willy]

2 hours ago, Joe Beechnut OBN said:

 

https://www.automationdirect.com/adc/overview/catalog/cables/sensors_-z-_switches/pico_(m8)_harsh_duty_-z-_food_-a-_bev._q-z-d_cables