Minelab GPX 4500 Batteries Original? Fakes? And Which Wireless Headphones?

[ikaruz]

so, i recently bought a minelab gpx 4500, it came with 2 small homemade batteries, and 3 normal batteries. the person who i bought the detector only used the small batteries and it is what i will use too (and he bought the detector from other person maybe at almost 2 years), he never touched the normal batteries, so i was expecting they could be faulty and discharged when i bought the detector. i tried to use them, fully discharged, i'm still charging them. i opened the batteries and they look diferent

the first battery, it work, but gives a very low sound the headphones... the big question is why? the battery have written 7.4V 74Wh. and it's original?

the second battery, it has rust, a missing screw and a loose battery, so it's faulty, the battery have written 7.4V 9.2Ah. it's original?

the third battery, it work, and gives a normal sound with the same headphones (only the first battery gives a low sound, this gives a normal sound like the small batteries), the battery have written 7.4V 9.2Ah. it's original?

so, the questions are, are all original? why is the reason of the first battery give a low sound?

and i have another question, wireless headphones, wich brands and models do you recomend? thanks

 

ps: the batteries are at the replies after this

[ikaruz]

battery one

[ikaruz]

battery two

[ikaruz]

battery 3:

[phrunt]

7.4V 9.2Ah and 7.4V 74Wh are proper labelling, they changed it at some point and newer ones have it differently, I think they changed it for airline shipping to make it easier being lithium, I can't remember which is which way around but in your case it doesn't matter just one sort is the newer battery and the other the older battery.  I think the 9.2Ah is the modern battery from memory.  The tested by green stickers were used on all the early GPX stuff.

The homemade batteries don't have the amplifier built in like the original batteries, the amplifier kicks in when a correctly wired mono plug is plugged in, if a stereo wired plug is plugged in the amplifier is disabled.  This is so headphones don't blow your head pff.  You can read about the correct wiring for the amplifier in the GPX manual however to disable the internal amplifier you need a stereo plug end on your speaker/headphones with only the Tip and Ring connected to the speaker, the sleeve needs to be an open circuit and any mono plug the amplifier is enabled.  The built in amplifier was handy for using speakers rather than headphones, being a single speaker they came wired in mono, many had a speaker on each shoulder of their harness, and I preferred this method for some time and that was joining two of the speakers wires together but keeping it a mono plug.  These were the common speakers used, GME SPK07, they were water resistant and you just put a clip on the back of them to attach them to your harness.

You can replace the batteries in there and bring them back to life.  They also could develop a fault where the amplifier in them died which may explain why one battery is only doing low volume.    Steelphase used to sell the little parts kit to repair the amplifier, but I believe he's no longer in business, but a Minelab service center may help, probably not though. @PhaseTech maybe able to help there.

You can just use an aftermarket booster to boot the audio, many of the makers of these have slowed down or disappeared too.   The steelphase sp01 was always top notch, Gold Snitch is another good one but not sure they're even available anymore, Doc makes one from www.docsdetecting.com but not sure if he still makes his either, older lesser used detector slowly losing support.  😞

One of the best things to do is just plug in a Bluetooth Low latency transmitter like the Avantree relay and use Bluetooth low latency headphones which bring up the volume of the signal being powered.  I don't have a lot of experience with good brands of headphones, I've only used the supplied Minelab ones from other detectors for this role but I tend to use the Avantree Torus neck speaker which is Bluetooth low latency, great volume and works well with their Avantree Relay transmitter on my GPX 5000 using an aftermarket light weight battery with no built in amplifier.

 

[ikaruz]

21 minutes ago, phrunt said:

7.4V 9.2Ah and 7.4V 74Wh are proper labelling, they changed it at some point and newer ones have it differently, I think they changed it for airline shipping to make it easier being lithium, I can't remember which is which way around but in your case it doesn't matter just one sort is the newer battery and the other the older battery.  I think the 9.2Ah is the modern battery from memory.

The homemade batteries don't have the amplifier built in like the original batteries, the amplifier kicks in when a correctly wired mono plug is plugged in, if a stereo wired plug is plugged in the amplifier is disabled.  This is so headphones don't blow your head pff.  You can read about the correct wiring for the amplifier in the GPX manual however to disable the internal amplifier you need a stereo plug end on your speaker/headphones with only the Tip and Ring connected to the speaker, the sleeve needs to be an open circuit and any mono plug the amplifier is enabled.  The built in amplifier was handy for using speakers rather than headphones, being a single speaker they came wired in mono, many had a speaker on each shoulder of their harness, and I preferred this method for some time and that was joining two of the speakers wires together but keeping it a mono plug.  These were the common speakers used, GME SPK07, they were water resistant and you just put a clip on the back of them to attach them to your harness.

You can replace the batteries in there and bring them back to life.  They also could develop a fault where the amplifier in them died which may explain why one battery is only doing low volume.    Steelphase used to sell the part to repair the amplifier, but I believe he's no longer in business, but a Minelab service center may help, probably not though.

You can just use an aftermarket booster to boot the audio, many of the makers of these have slowed down or disappeared too.   The steelphase sp01 was always top notch, Gold Snitch is another good one but not sure they're even available anymore, Doc makes one from www.docsdetecting.com but not sure if he still makes his either, older lesser used detector slowly losing support.  😞

One of the best things to do is just plug in a Bluetooth Low latency transmitter like the Avantree relay and use Bluetooth low latency headphones which bring up the volume of the signal being powered.  I don't have a lot of experience with good brands of headphones, I've only used the supplied Minelab ones from other detectors for this role but I tend to use the Avantree Torus neck speaker which is Bluetooth low latency, great volume and works well with their Avantree Relay transmitter on my GPX 5000 using an aftermarket light weight battery with no built in amplifier.

Thanks for the answer. The battery with red batteries is the One aparently working ok... But i only tested a few minutes inside home.

The One with sound issues its the first (the One with the battery inside a box)

[phrunt]

You should be able to replace the batteries in the one with the multi coloured batteries, just get rid of all of that corrosion at the time of resoldinng, it's a messy terrible job they've done replacing them in the past, use solder tabs and hot glue like the original red batteries one.

[PeterInSa]

In the past I have used a Battery repack service in Oz for a Minelab 2200, In Oz a repack for a 4500 would cost around $99 US, if available in the US, with no mucking around and a 1 year warranty. To me its worth it for your 4500, if you are not into DIY.

https://www.ebay.com.au/itm/255693369565

[Alexnov]

8 hours ago, ikaruz said:

Итак, недавно я купил Minelab Gpx 4500, в комплекте с ним шли 2 маленькие самодельные батарейки и 3 обычные батарейки. Человек, у которого я купил детектор, использовал только маленькие батарейки, и я тоже буду их использовать (а он купил детектор у другого человека, возможно, почти 2 года назад). Он никогда не трогал обычные батарейки, поэтому я ожидал, что они могут быть неисправными и разряженными, когда покупал детектор. Я попытался использовать их, они были полностью разряжены, и я всё ещё заряжаю их. я вскрыл батарейки, и они выглядят по-другому

Первая батарея работает, но звук в наушниках очень тихий... Главный вопрос: почему? На батарее написано 7,4 В, 74 Вт·ч. Это оригинал?

Вторая батарея покрыта ржавчиной, в ней отсутствует винт, а сама батарея неплотно прилегает, поэтому она неисправна. На батарее указано 7,4 В, 9,2 Ач. Она оригинальная?

Третья батарея работает и обеспечивает нормальный звук в тех же наушниках (только первая батарея обеспечивает тихий звук, а эта — нормальный, как у маленьких батареек). На батарее написано 7,4 В, 9,2 Ач. Она оригинальная?

Итак, вопросы: все ли они оригинальны? Почему первая батарея издает тихий звук?

и у меня ещё один вопрос: какие бренды и модели беспроводных наушников вы можете порекомендовать? спасибо

 

p.s.: батарейки находятся в комментариях под этим постом

The HP 1 battery has a faulty board, the speaker amplifier is burnt out and the entire circuit is malfunctioning. It's not hard to fix it yourself.