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LIPO battery question (Teltronic HTT-500 / NIROS HDX-6000)

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Erik211

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Some time ago I purchased two NIROS HDX-6000 (Niros branded version of Teltronic HTT-500). Batteries are dead, and I really just want to bring these radios to live as I'm curious to know how they work (and to see if I can catch any DMO conversations from home). Thus, I actually don't need to run these radios on battery - I have a power supply set to 7,4V output here which I want to use.

Now to my issue. Being LIPO battery radios, the battery connector on the radio has 4 terminals. My guess is +,-, T and signalling of battery status. The radio actually starts when connecting 7,4V to the plus and minus terminals. However after a few seconds the radio says battery pack error, and shuts down. So I wonder how to simulate an OK battery pack? The T-terminal should be fairly easy, just finding the right resistance of the battery's termistor at a safe temperature (maybe a 10k resistor will do the trick). But the fourth terminal is a big question mark to me. Any ideas?
 

Erik211

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Thanks for the reply. I believe the termistor is connected to one terminal and to ground. The 4:th terminal might be the junction as you say - or perhaps gives some sort of signalling.
I'm thinking I could try and add a resistor between the two unknown terminals to see what happens. But if anyone else has a guess on what value these two terminals should give - that would be great information - before I burn something here :eek:
 

Erik211

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Open up a battery and see what's in it.
Thanks for the suggestion. I already did that to one battery and there's a PCB between the cells and the terminals. I attach a photo of it, if that could give a clue. However the PCB is in a really bad shape to say the least. This combined with the fact that there is absolutely no power left in the battery cells has made me fail to understand what the correct output should be...


battery_pcb.jpg
 

Olssonswe

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The radio need two negative one positive
- like this (- - _ + ) pin three is not used.
power source 6-11 volts the radio breaks if it becomes more than 12.0 volts
two 18650 batteries can power the radio around 24 hours I use a transformer for stationary use


the original charger cannot charge batteries if you connect as I connected
 

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Olssonswe

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Another fun thing is no tetra radio has scanning as far as I know (DMO mode ) but this one you can scan "mechanically" by holding down the channel selector
 

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Ubbe

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I also bought one, there where only like $50 but where to get the programming cable? The seller wanted $100 for one.

It's always a circuit board in a standard lipo battery. It is used for balancing the charge so each cell have equally much charge and voltage and are also for current limit for short circuit protection and to switch off the connection to the lipo's when their voltage have dropped too much, as lipos will be destroyed if they are allowed to discharge too much and drop to a too low voltage.

/Ubbe
 

belvdr

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Be careful with LiPo batteries. Any damage can lead to a nice, uncontrollable fire. When I charge mine, I use a balancing charger and they are inside an explosion-resistant, fire proof bag, called LipoGuard. The batteries also need to be charged at a specific rate.
 

Olssonswe

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$ 100 is probably what it costs, there is not much to choose from

okay the radio does not need LiPo it goes just as well with regular Li-ion

at least for reception has not transmit ( TX ) so much
 
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