Question about Cobra 2 mile FRS 2 pack Value Pack with Recharge batteries/charger 2-Way Radio

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I need an electrical connection for 2-way Radio charger base.

I have Cobra PR3100-VP 2-way radios with a dual charger base but I don't have the transformer and wire to connect from the wall outlet to the charger base. I need the specifications for the correct transformer output to see if one of the many transformer wires I have will work or may even be the manufacturer's supplied transformer.

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Check the voltage of the battery and pick something 1-3 volts higher.

If you have an ohm meter you can meter between battery contacts and charger wall wart jack and see which one is positive and negative and match your transformer up to it.

Posted on Jan 23, 2009

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Where can I get a new set of rechargable batteries for my cobra microtalk cxt275


The Cobra CXT275 radios can operate on any type of battery (Alkaline, Ni-Cad, NiHM). Each radio uses 4 AAA batteries. Only special rechargeable batteries can be recharged in the actual radio (see below)
If I remember correctly, they come from the factory with NiHM batteries rated at 300mAH. "mAH" stands for milli-Amphere-Hour and it represents the storage capacity of the battery. (The larger the mAH, the longer run time of the battery)

You have 2 options: A or B
Option A) Buy a set of Nickel-Metal Hydride AAA rechargeable batteries and a external battery charger. When the batteries die, pop them out of the radio, and charge them in the external charger. When they are recharged, pop them back in the radio.
Option B) If you want the ability to charge the batteries in the radio, using the "drop-in charger" then you will need modify the batteries so they can charge in the radio.
Follow these steps: You must be somewhat electrically inclined to do this...Note: By doing this you are going to void the warranty of the radio and new batteries that you just purchased.
1) Buy a set of Nickel-Metal Hydride AAA rechargeable batteries. You can probably find some rated at 600 mAH (this will extend the run time)
2) Looking at the back of the radio with the cover removed, there are 4 slots for batteries.
3) Looking at the battery slot on the far right, you should notice 2 contacts for the negative contact. The one on the bottom, is the contact for the radio to receive power from the battery. The one on the side (about 1/8" inch up from the bottom contact), is the contact for the charger to recharge the battery.
4) You will need to modify 1 battery for each radio. Somehow you need to bridge the bottom contact with the side recharge contact.
5) (look at the negative end of the cobra factory batteries and this should help you realize what you need to do) depending on the manufacturer of the new rechargeable batteries, you may be able to use an X-acto knife and remove 1/4" of the plastic wrapper from the bottom of the battery on the negative end. This should reveal the metal shell of the battery that can mate with the radio's side recharge contact.
If it does not, you need to find another way to have it mate with the bottom contact. You might be able to use some Aluminium Foil to bridge the bottom contact with the side recharge contact. Be sure the Aluminium Foil does not touch the positive contact of the battery to the left! You could have an electrical short!
6) Insert the Modified Battery into the right slot.
7) Insert the other 3 new batteries into the other slots. These do not have to be modified. Only the right most battery needs to be modified.
8) Drop the radio in the charger for the batteries to charge. The red LED on the charge base should come on. If it does not, then the side recharge contact is not making a good connection with the negative battery terminal.
9) If the red LED comes on, then the modification works. Let the batteries charge for 24 hours for their first initial charge.
10) When the batteries die after radio use, then charge them for about 12 - 16 hours in the drop-in charger. Do not let the radios sit in the charger for long periods of time. That can destroy the batteries. Take the radios out of the charger when the allotted time has passed.
11) If you hardly ever use your radios you will want to drop them in the charger for about 8 hours every 3 months. This will keep the batteries fresh without damaging them.
I hope this helps, Thomas (Electrical Engineer)

Feb 22, 2012 | Cobra Two-Way Radios

1 Answer

I just put new batteries in my Cobra microtalk PR 3500 DX battery charger. How long will it take to charge them? Should the Radio's be in the on or off position. Thank You mjbarry42@comcast.net Mike...


The radios will work fine while being charged, but they will charge faster if turned off. Normal charging time is 8-10 hours, but I would recommend an overnight charge - they won't overcharge or be damaged by the longer charge time.

Bill B.

Nov 05, 2010 | Cobra microTALK PR 3500-2 DX VP 2-Way...

1 Answer

The chargers light go off how will I know the radios have been charged


Then they are charged. Or the battery is bad if you have no power.

When they are low it takes 12 to 24 hrs for full charge.

Nov 01, 2010 | Cobra microTALK LI 7200-2 WX VP Two Way...

1 Answer

I need to download a manual for Cobra 2way radios model #PR190 and I have paid.


Paid what? Follow the link below for a free download of your manual:

http://www.retrevo.com/support/Cobra-PR-190-VP-2-way-Radios-manual/id/11238ci275/t/2/

Bill B.

Oct 25, 2010 | Cobra 2-Way Radio 2 pack

1 Answer

What's the range of GM338 motorola base radio?


i have a similar set and i get abot 20 maybe on good days 22 miles hope that helps

Jul 21, 2009 | Cobra Li 6000-2 WX VP GMRS/FRS Two-Way...

2 Answers

LI 6000 2-way charging base does not charge- no indicator light


Dear sir,

It seems that ur adoptor is not ok , u can save the money by purchasing any 9 V adoptor, It available for less than 1 USD in our country ..& cut the wires of ur budled adoptor & fix them in correct polarity with the wire connecting the charger base ..( before doing this proces check voltage output from adoptor by using a multimetre.)
Regards
Raj

Jan 12, 2009 | Cobra Li 6000-2 WX VP GMRS/FRS Two-Way...

1 Answer

Charger / Adapter


Radio shack sales a universal power adapter. <CAUTION> make sure the adapter is set to the correct voltage and that the tip is set to the correct polarity. The only other option is to order the adapter from Cobra.

Pat

Aug 05, 2008 | Cobra Li 6000-2 WX VP GMRS/FRS Two-Way...

1 Answer

Cobra microTALK PR 3500-2 DX VP 2-Way


The Cobra microTALK PR-3500-2 DX VP Radios are supposed to be equipped with acoustic noise filters that are built in the microphone. This problem could have been caused from the radios getting wet, damaged, or the microphone going bad, the microphone can be replaced if you still have the warranty, but if you want to save money you may wan to get a new set of 2-ways. I suggest the Uniden GMR325-2, these models are inexpensive and have an approximate 5 mile range in good conditions.

Good Luck!

Jul 05, 2008 | Cobra microTALK PR 3500-2 DX VP 2-Way...

1 Answer

Cobra Li 6000-2 WX VP GMRS/FRS Two-Way Radio


This radios has a Reference Xtal, dropping the radio, could cause that the xtal goes out of frequency, this means tha the radios has a frequency error and the range of opearatin seems to be reduced or even null. With out knowlegement and equipmente, there is nothing that you can do.

Nov 21, 2006 | Cobra Li 6000-2 WX VP GMRS/FRS Two-Way...

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