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GPX Custom Battery Pack
Posted by: soky72
Date: May 23, 2018 08:14AM
Here's a battery pack I made for my GPX. I used 18650 rechargeable batteries which is probably the most common kind used for built in battery packs like for laptops and flash lights. I used the plug off some old computer speakers that plug into a 4.2 low latency bluetooth transmitter (the white round disk). The power leads were then soldered to a Fatshark Battery Box used for powering Fatshark Drone goggles. You can use any 18650 battery holder but I liked the fatshark battery box because it has the battery indicator on the side. It's important when building an alternative battery sources to use good quality batteries and charger. The batteries are Panasonic rated at 3400 mAh. You can find batteries with higher ratings but it will be junk as 3400 is about the current max output for good 18650s. The longest I've gotten to hunt is 2 hours and I showed half charge so I feel confident I can go 3 to 3.5 before putting two more in and I have 8. The setup is extremely light and I have several bluetooth options including Sony and Minelab earphones but prefer ear buds as the sound is crisper and it's cooler in summer.




Re: GPX Custom Battery Pack
Posted by: cookie58
Date: May 23, 2018 08:26AM
Great post Soky. I already bought a used Screamer or I would be asking a lot of questions. I just wondered if by using a different battery system, will it affect the warranty on the GPX? Great job........

Re: GPX Custom Battery Pack
Posted by: soky72
Date: May 23, 2018 08:44AM
I picked up my GPX used a couple years back as I didn't want to spend a ton on it if it wasn't what I wanted. Little did I know it's the greatest thing since sliced bread. Anyway the detector was used by a prospector up north and very worn cosmetically but has worked like a dream and I got it and a load of stuff cheap enough that I haven't worried about experimenting and have no idea if it even has any warranty. Besides I'm not sure if it's any different then using an aftermarket battery source like the Screamer??? The two 3.7 volt 18650 batteries equal the 7.4 volts needed for the GPX. Some people use the 7.4 volt LiPo RC batteries which can be purchased in much higher mAh ratings but LiPo batteries are more dangerous and need more maintenance then I want to put in but it would be no problem to switch to a LiPo, just unplug the fatshark battery box.

Re: GPX Custom Battery Pack
Posted by: cookie58
Date: May 23, 2018 06:35PM
Neat job, Soky. I still have the factory battery and may want to sell it at some time. I really like the Screamer because of the volumn adjustment being so handy. However, If I did not have it, I would be looking at your design. What type of connection cable do you use and what do you think the total cost of yours would be?

Re: GPX Custom Battery Pack
Posted by: soky72
Date: May 23, 2018 10:37PM
Cookie58, if you use a Bluetooth setup your amplifier will be in the headphones or earbuds and you can make it so loud it's not bearable at least to me. I did have the stock battery mounted on the side and I still plugged in my Bluetooth transmitter and used Bluetooth ear buds. Once you go wireless it will ruin you to cords. As for cost a bit hard to say but it wasn't bad. I had a bunch of power cords in different lengths I got with the detector so I cut one down but you can buy the the 5-pin power cord plugs online for about 7-8 bucks. Only 4 of the pins are used and you could buy wire about anywhere to solder to the pins then shrink wrap the wires together. From there I soldered the positive and negative power leads to a Deans Connector, popular in the RC world. The other 2 wires are the positive and negative for the audio and they went to the audio plug salvaged from old computer speakers. I then soldered a Deans Connector to the Fatshark battery box which are $15-20 bucks online. The FM transmitter was $40 but I've seen similar since for $25. My ear buds were like $40 and I have Sony Headphones, an Xmas present, Minelab M80 headphones and receiver from my Equinox 800. The 18650 batteries were $17 for 2 and the universal charger was $30. Thing is I use the Bluetooth stuff all the time while working on projects, mowing, working out, etc. The Bluetooth transmitter can be hooked to your tv for watching quietly and I use rechargeable AA's in everything so the universal charger is handy. I'd own most of these items even without my detector. Plus the setup is very light and unobtrusive.

Re: GPX Custom Battery Pack
Posted by: cookie58
Date: May 24, 2018 07:49AM
Great information, man. Thanks for sharing........

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Re: GPX Custom Battery Pack
Posted by: Digger70pa
Date: May 24, 2018 07:58PM
Wow those two little batteries power the machine for 3.5 hours? That's awesome.



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